3.204 Fall and Rise of China: One Hundred Regiment Offensive #3

Last time we spoke about the second phase of the One Hundred Regiment Offensive.  During the second phase of the Hundred Regiments offensive, CCP forces emphasized strongpoint and transportation warfare across the Taihang/Jizhong area. Units were organized with wings containing Japanese positions while a central force struck deeper, as in the Renhe Dasu fighting in early October 1940. Night raids seized strongholds, while engineers and sabotage teams disrupted roads, bridges, and mobility, and ambushes targeted Japanese foraging and supply routes. Across these theaters, the strategy was consistent: make Japanese control porous by destroying or capturing local nodes and forcing constant repairs, re-routing, escorts, and slowed reinforcement, so occupation logistics and strongpoint networks could not function reliably. This approach supported wider offensives by isolating strongpoints, draining enemy strength, and giving Communist base areas room to endure and expand.

#204 The One Hundred Regiment Offensive Phase Three

Welcome to the Fall and Rise of China Podcast, I am your dutiful host Craig Watson. But, before we start I want to also remind you this podcast is only made possible through the efforts of Kings and Generals over at Youtube. Perhaps you want to learn more about the history of Asia? Kings and Generals have an assortment of episodes on history of asia and much more  so go give them a look over on Youtube. So please subscribe to Kings and Generals over at Youtube and to continue helping us produce this content please check out www.patreon.com/kingsandgenerals. If you are still hungry for some more history related content, over on my channel, the Pacific War Channel where I cover the history of China and Japan from the 19th century until the end of the Pacific War.

After the two large-scale offensives carried out over wide areas of North China, the Japanese army did what it always did when control started to slip: it tried to turn mobile pressure back into something it could "manage" again. The Eighth Route Army's continued fighting had shown that Japanese-occupied space was not secure, and that base areas could still resist, strike, and persist even while under counterpressure. That was dangerous for occupation. If the enemy could keep operations going, Japanese lines of movement stayed uncertain and "stabilization" became a temporary illusion.

To prevent the situation from worsening and to re-stabilize the occupied areas as quickly as possible, the Japanese mobilized heavy forces and launched retaliatory counter–"mopping-up" operations against anti-Japanese base areas in North China beginning October 6. The Japanese attempt wasn't only to punish; it was designed to take advantage of an asymmetry: the Eighth Route Army was striking and fighting continuously, and it did not have the luxury of resting, replenishing, and re-cohering as neatly as a garrison army might. Japanese commanders hoped that if they struck hard enough in enough places, the Communist main forces could be isolated, destroyed, or at least forced into a defensive posture that would break their operational tempo.

At Liaodong and Yulin, Japanese reinforcements also created a second political-military stake. After the Yuliao Campaign ended, the Eighth Route Army headquarters issued instructions on October 1 to major regions, warning that enemy reinforcements in Liaodong and Yulin might use the opening to "sweep" the Taibei region. In the Communist operational mind, this wasn't just one threat; it was a pattern. A "sweep" could come as a wave that pushed inward, burned villages, destroyed supplies, and tried to force Communist forces out of their protected networks. Even if the offensive couldn't win a conventional decisive battle, it could aim to strip the base areas of people, food, and mobility—things that make guerrilla and strongpoint warfare possible.

By October 19, 1940, the Eighth Route Army headquarters issued a counter–"mopping-up" operation plan, and civilian and military authorities in various regions launched counter-"mopping-up" operations accordingly. This is important background: in these campaigns, "mopping-up" was not only an army activity. The Japanese were attempting to break the base system itself—its logistics, its local administration, and the relationship between armed units and civilians who hid, moved, fed, and replaced them. So the counter-operations had to be just as systemic. The Communists needed to keep people alive, keep movement possible, and keep the enemy from consolidating inside a cleared space.

In southeastern Shanxi's Taihang and Taiyue regions, the Japanese 1st Army aimed to strike the main force of the 129th Division and destroy anti-Japanese base areas by running a series of mopping operations from October 6 to December 5. The plan had a typical occupation logic: push through strongholds gradually, clear pockets methodically, and rely on local superiority—especially in manpower, logistics, and the ability to reinforce by road. And because the Communist main force had been operating without meaningful rest after the earlier offensives, the Japanese believed they could catch formations while they were still "in between battles."

On October 6, in the Taihang region, more than 800 enemy troops from Wu'an in western Hebei began a "mopping-up" operation in the Yangyi area. By October 11, the Japanese posture escalated. Part of the Japanese Independent Mixed 4th Brigade departed from Liaoxian and Wuxiang, while part of the 36th Division departed from Lucheng and Xiangyuan; together they totaled over 3,000 troops. Coordinating from north and south, they carried out operations to "mop up" both banks of the Zhuozhang River between Yulin, Liaoxian, and Wuxiang, encircling and clearing the south side of the Yulin–Liaoxian highway. This emphasis on riverbanks and highway corridors reveals the Japanese method: move along terrain that controls movement, then compress enemy options until the defenders have to fight inside a narrowing space.

The counter to that method required more than bravery. The Eighth Route Army's 385th and 386th Brigades, along with the 1st Column of the Decisive Battle, fought on inner lines—where they could move more rapidly between known local positions and threaten the enemy's flanks or supply behavior. Meanwhile the New 10th Brigade fought on outer lines, where it could intercept, delay, and force the enemy to spend time reacting instead of clearing.

By the morning of October 15, the New 10th Brigade delivered a concrete example of that interception strategy. Two regiments ambushed an enemy motor-transport convoy at Gongjiagou on the Heliao Highway, destroying more than 40 vehicles and annihilating more than 100 Japanese soldiers escorting the convoy. The meaning of a convoy ambush is strategic even when the numbers are modest: vehicles represent speed, logistics, and reinforcement. If the enemy loses vehicles repeatedly, "mopping" becomes slower, and slower clearing creates openings for the defenders to reorganize, disperse, or shift main effort.

After that, on October 17, the enemy forces that had been mopping up the convoy withdrew in different directions. Withdrawal in multiple directions is a sign that the Japanese clearing operation, meant to compress a space, had instead been forced into a reactive mode. It also hints at a recurring pattern in these years: Japanese units could clear what was already weak, but when defenders hit their movement corridors, the occupiers had to spend time and combat power simply to recover mobility.

The next major sweep began October 20, 1940, and it was much larger. Nearly 10,000 troops—from the 36th Division and Independent Mixed Brigade No. 4—set off from multiple locations, including Wu'an, Liaoxian, Wuxiang, and Lucheng, to sweep the area east and west of the Qingzhang River, focusing on land between Matian and Zuohui. Crucially, that was not random ground. The Japanese sought to strike the CCP Central Committee Northern Bureau, the Eighth Route Army headquarters, and the 129th Division headquarters, along with party and government organs of the Jin-Ji-Yu Border Region, located together with Shexian and Piancheng. In other words, the Japanese targeted not just armed units but the political-administrative heart that makes base areas function.

Once in the attack area, the Japanese carried out "mopping-up" operations paired with burning and killing for several days. That brutality wasn't only cruelty; it served a purpose. Burning villages, destroying crops, and killing civilians could deny the base area food and shelter while making local cooperation more difficult. Then, on October 26, the Japanese began to withdraw and carried out mopping-up in different areas on the way back. The base area was "severely damaged and destroyed," indicating that even when the Japanese didn't annihilate the main Communist force, they could still achieve degradation—hurting the system they needed to keep operating.

But the Communists were not simply absorbing damage. On October 29, a force of over 500 men from the 36th Division, plus over 400 supply and laborers, was mopping up Huangyandong and advanced through Zuohui to Guanjia'nao east of Panlong, preparing to return to Wuxiang. This is where counter-mopping becomes operationally dangerous for the occupier. Supply and labor detachments move differently from combat formations, and they represent an enemy's assumption that the base area is being "cleared." The Eighth Route Army headquarters ordered, at 1:00 p.m., for the 129th Division to concentrate its main force to annihilate the enemy.

That night, the 129th Division—uniting the main forces of the 385th and 386th Brigades, parts of the New 10th Brigade, and the First Column of the Death Squad—surrounded the enemy at Guanjia'nao with a plan to launch a general offensive at 4:00 a.m. The besieged enemy, besides quickly building fortifications, seized Fengkengding high ground southwest of Guanjia'nao under cover of darkness. The two high points helped defenders support one another and resist stubbornly. The battle lasted until dawn on October 31, when most of the enemy had been annihilated, leaving only more than 60 men to hold positions.

Then reinforcements arrived—over 1,500 from Huangyandong—supported by more than 10 aircraft. The 129th Division withdrew, and the remaining enemy fled toward the flood, leaving behind more than 280 corpses. By then, most Japanese troops had withdrawn from the central base area. The background stake is clear: "mopping-up" could damage and burn, but if defenders could convert the Japanese attempt into a trap—especially when enemy units had become separated from their core and committed to clearing—they could turn a destructive operation into a costly one for the occupier.

In early November, the Japanese continued. In Licheng south of Taihang, Japanese forces invaded Nanweiquan and Beiweiquan and then Xijing. Elsewhere, Japanese forces in Xiangyuan invaded Panlong via Xiying, attempting to attack Dongtian and the area around Zhuanbi, where the Eighth Route Army headquarters was located. In that moment, the 386th Brigade was ordered to rush to the north–south line of Damocun, east of Panlong, block the invading enemy, and cover the transfer of the Eighth Route Army headquarters.

At 9:00 a.m. on November 3, 1940, fierce fighting broke out as the troops finished deploying near Damocun. The Japanese launched continuous attacks and captured some positions. The 386th Brigade held until 4:00 a.m. on November 4, then withdrew after the headquarters successfully moved. The Japanese attempt to launch a pincer attack failed, and they retreated to the Baijin Line on November 5. Even when Japanese action couldn't be fully blocked, the counter's aim was not only tactical survival but prevention of strategic encirclement—protecting the central institutions and preserving the ability to fight again.

In the northern Taihang region, more than 2,500 enemy troops from Heshun arrived in Yushe on November 3 via Hanwang Town and Changcheng Town, reinforcing Japanese forces in the Yu, Liao, and Wu areas. Then they carried out repeated mopping operations south of the Yuliao Highway, including Jiangtang, Lingshang, Songjiazhuang, Guojiao, and Dayouyi. Harassment and attacks by military and civilians forced Japanese troops back into their strongholds by the 13th. A "40-day" counter-mopping operation in Taihang came to an end. The term "40-day" isn't only calendar time; it suggests that these were not one-off battles but sustained campaigns of movement, dispersal, and repeated harassment meant to drain the enemy's capacity.

Starting November 17, the Japanese launched a multi-pronged attack on Qinyuan and the area north of Guodao Town. The attack involved part of the 37th Division from Qin County and Nanguan Town, part of the Independent Mixed Brigade from Pingyao, Jiexiu, and Huo County, and a battalion of the 41st Division from Hongdong—more than 7,000 troops deployed to attack Qinyuan and the north area. But the Taiyue Military Region response shows how the Communist counter-mopping wasn't always to meet force with force. To avoid the enemy's "sharp edge," the Taiyue Military Region formed two detachments—Qin East and Qin West—with leadership and main force moving to both sides of the Qin River outside the Japanese attack zone, targeting scattered Japanese troops instead of being fixed into a single killing field.

By November 23, due to harassment by local armed forces, the Japanese reached the attack zone and then carried out dispersed mopping operations. Qinyuan County was the most severely damaged, with more than 5,000 people killed (about one-tenth of its population), nearly 10,000 livestock killed and over 7,000 stolen, and 30,000 to 40,000 houses destroyed. Those details are brutal, but they explain why background stakes mattered: "mopping-up" was meant to break the social base. If civilians died or fled, the guerrilla system became harder to sustain.

The response from the Dayue Military Region seized the opportunity created by Japanese dispersal. On November 23, the 42nd Regiment of the Qinxi Detachment annihilated more than 100 Japanese soldiers in Guantan. On November 27, parts of the 42nd and 59th Regiments killed or wounded more than 160 in Huhanping and Mabei. The Qindong Detachment's 17th and 57th Regiments inflicted serious damage in a series of places—Guang'ao, Chenjiagou, Longfosi, Wuyuanzhen, Nanweicun, Nanli, and more. The 17th Regiment's battle at Longfosi annihilated more than 100 Japanese. Additional heavy losses were inflicted by the 212th Brigade in Jiaokou. By December 5, the Japanese were forced to withdraw from the Taiyue area in separate routes. Strategically, dispersal punished the occupier because scattered units are harder to protect and easier to ambush.

Across the Jin-Cha-Ji Border Region, anti-"mopping-up" operations unfolded gradually, beginning with the Pingxi area, the first target of the Japanese on the path toward the Japanese-held headquarters and rail lines. Pingxi mattered because it directly threatened the headquarters of the Japanese North China Area Army and Beiping—the puppet regime's center—and also threatened the Pinghan and Pingsui railways, North China's main transportation lines. So Pingxi became an operational priority: if the occupier couldn't keep the rail network secure, their ability to reinforce and supply their own strongpoints suffered.

On October 13, 1940, more than 10,000 Japanese and puppet troops attacked Sanpo, the central area of the Pingxi base area, in 10 routes. This attack used a methodical, steady approach: advance gradually, rely on strongholds, and cover 5 to 10 kilometers each day. In response, the Pingxi Military Sub-district countered using timely maneuvers of its main forces and extensive guerrilla warfare. Over more than a week of fighting, the enemy was constantly harassed and attacked, wearing them down. Although Japanese troops penetrated deep, they failed to identify the main force's movements. By November 21, when the encirclement tightened further, the Pingxi main force jumped out from the Sanpo area and moved southwest. Encountering the enemy at Pengtou, it then moved to the Yegu and Datai line east of Bancheng.

After the Japanese entered the Sanpo area, they conducted widespread burning and killing and looted grain. Starting from the 23rd, the Japanese retreated in different routes. By the end of October, the main force had withdrawn from Pingxi, but more than 2,000 troops remained in the Pingxi anti-Japanese base area to build strongholds and roads. Strongholds were added in places like Changping and Wanping—14 strongholds alone—and villages such as Dongzhaitang and Dujiazhuang came under their control. The base area began to shrink and shrink. That shrinkage is the other background stake: even when guerrilla forces avoid annihilation, the occupier may still carve away space through fortification.

On October 19, 1940, the Eighth Route Army headquarters instructed that enemy attacks in Pingxi and Taihang might turn around and attack the Beiyue area. The Jin-Cha-Ji Border Region needed to prepare quickly to crush these "mopping-up" operations, coordinating Party, government, military, and civilians and conducting in-depth combat mobilization. The main force should assemble in appropriate positions and prepare to annihilate one or two enemy forces decisively. The headquarters also instructed the 129th and 120th Divisions to cooperate actively.

By November 9, 1940, the Japanese struck again in a massive sweep. The 110th Division, along with other units and more than 14,000 puppet troops, launched a "mopping-up" operation in the jurisdiction of the 1st Military Sub-district. The Japanese and puppet troops moved in coordinated lines: along the line of Yi County, Dalonghua, Wang'an Town, Laiyuan, and Chajianling from north to south, while those in Baoding and Mancheng moved east to west. The intent was to squeeze Communist sub-district forces into a narrow area for a decisive battle.

On November 10, the Jin-Cha-Ji Military Region issued operational guidelines and deployments for countering "mopping-up" operations. By the 12th, in response to Japanese widespread burning and killing, it further instructed that without hindering mobility, the main force could disperse a portion of troops—no more than one-third—to strike resolutely at attempts to burn and kill. That instruction captures the balance commanders tried to strike: disperse too much and you lose power; disperse too little and you become trapped by the occupier's brutality.

The Japanese then attempted to pressure multiple places. On November 9, more than 6,000 enemy troops from Laiyuan, Yixian, and Baoding attacked Guantou, Yinfang, Huangtuling, and Shenbei. On the 12th, their attack failed; they burned and killed people before retreating in different routes. At that time, the 1st Military Sub-district assembled the 1st and 25th Regiments to intercept them. One enemy force of more than 800 was intercepted on the 14th as it retreated from Wujiazhuang to Yuangang; some were killed or wounded. Even so, the enemy broke through under aircraft cover and retreated to Guantou. On the way, it was intercepted again by the 20th Regiment, suffering heavy casualties, and it fled back to Mancheng.

Then on November 13, more than 2,700 Japanese and puppet troops attacked the 3rd Military Sub-district; on November 14, about 2,600 advanced from Dingxiang, Dongye, and Wutai toward Fuping and its southwest area in two routes. The Japanese attacked with east-west coordination, launching joint attacks on Taiyu north of Fuping. The Jin-Cha-Ji Military Region headquarters and the command organs of the 3rd and 5th military sub-districts, along with the 2nd, 3rd, and 6th regiments and other troops, transferred to the outer line before the enemy encirclement formed. On the 16th, the Japanese launched a joint attack again on Taiyu and Zhangjiayu, and the guerrillas who failed to transfer fought hard. Commander Wang Pu and Deputy Director of the Political Department Hao Yuming were killed, and troops suffered more than 100 casualties.

On November 18, the enemy from Taiyu quickly occupied Hanping City. By the 21st, enemy forces from Daying via Shentangbao and Wuwangkou, and from Wutai via Taihuai, Shizui, Longquanguan, and Xiaguan, also gathered in Fuping City. After occupying Fuping, the Japanese launched repeated attacks "sweeping" areas under the jurisdiction of the 3rd Military Sub-district from both inward and outward strongholds, conducting brutal burning and killing and destruction. On the night of November 21, the 2nd Regiment dispatched more than 30 men to raid Dangcheng and attack Japanese barracks with grenades. The Japanese panicked and fired guns and cannons all night. On the 26th, four plainclothes officers infiltrated Baoding and attacked a theater where the Japanese army was holding a meeting, causing panic among the Japanese. The enemy that had invaded the base area withdrew in different routes on the 25th.

By December 3, 1940, most Japanese troops had withdrawn from the Beiyue area, but more than 1,000 remained along lines including Fuping, Wangkuai, Dangcheng, and Quyang to continue building points and roads in an attempt to occupy the area long-term. To force the enemy back, eliminate occupied points, and completely crush Japanese and puppet "mopping-up," the Jin-Cha-Ji Military Region organized the Fuping–Wangkuai Campaign starting December 9, with the 2nd, 3rd, 4th, and 6th regiments participating.

At 21:00 on December 14, the 6th Regiment attacked enemy forces in Dongzhuang. The 1st Battalion captured three fortified positions on the north mountain of Dongzhuang and rushed into the village, only for Japanese counterattacks to recapture fortified positions and kill or wound more than 170 Japanese during the counterfight. The 4th Regiment attacked the enemy in Fuping; the 2nd Regiment and guerrilla forces entered Dangcheng and Lingshan. On the 21st, more than 130 enemy soldiers escorting more than 100 pack animals carrying military supplies reached Wangkuai and were completely annihilated when they reached Wanglinkou.

By December 26, an ambush in the Xuancun area of the Pinghan Railway destroyed 14 Japanese trains and their vehicles as well as three heavy artillery pieces. On the 27th, more than 1,200 enemy troops advancing from Dongzhuang in Fuping were attacked in Luoyu and Tumen, suffering more than 140 casualties. The remaining Japanese withdrew from Fuping, Dongzhuang, and Wangkuai starting New Year's Day 1941. By January 4, the 55-day anti-"mopping-up" campaign had basically ended, with the Jin-Cha-Ji Military Region killing and wounding more than 2,000 Japanese and puppet troops while suffering 1,382 casualties itself. These numbers and dates show why background and stakes matter: the counter-mopping effort wasn't short. It was sustained, operationally demanding, and required continued offensive action even while facing superior Japanese resources.

The pressure didn't end there. From October 25 to early November, about 4,000 Japanese troops, including the 16th Independent Mixed Brigade, launched a mopping operation in the Miyu and Loufan areas of the 8th and 3rd military sub-districts in northwestern Shanxi, but they were attacked by local soldiers and civilians. In mid-December, Japanese forces transferred additional strength: parts of the 37th Division from southern Shanxi and the 41st Division from southeastern Shanxi, along with parts of the 3rd, 9th, and 16th Independent Mixed Brigades and the 26th Division from northwestern Shanxi—totaling more than 20,000 troops—to prepare for a full-scale mopping operation in northwestern Shanxi.

After the second phase of the Hundred Regiments Offensive ended, the 120th Division anticipated retaliation and actively prepared for counter-mopping. On October 30, the division was ordered to establish the Jin-Northwest Military Region, and on November 7, the military region was established in Lijiawan, Xing County. The Jin-Northwest Military Region had direct military sub-districts and six military sub-districts: the 2nd, 3rd, 4th, 8th, and Yanbei. Then the occupier escalated.

Starting December 14, 1940, the Japanese launched a full-scale mopping operation against the Jin-Northwest region. More than 5,000 enemy troops invaded the Mi-Yu Town area of the 8th Military Sub-district, more than 4,000 invaded Lin-Xian, and more than 6,000 attacked Xing-Xian and the area south of Bao-De from strongholds such as Lan-Xian and Qi-Lan. By December 23, Japanese forces had occupied all county towns, most market towns, and Yellow River crossings in the Jin-Northwest region except for Bao-De and He-Qu counties, and began to implement a systematic policy commonly described as the "Three Alls" policy.

The "Three Alls" emphasis is the clearest expression of stakes turning lethal. Japanese troops and traitors disguised themselves as the Eighth Route Army to lure and kill masses. They sent out core detachments to attack and repeatedly sweep the area, seeking to annihilate party, government, and military leadership organs—focusing on destroying the rear organs and facilities that made Communist endurance possible. According to incomplete statistics, more than 5,000 people were brutally killed during these sweeps. In Xingxian County alone, 150,000 catties of grain were looted and burned; in the 4th Military Sub-district, more than 5,000 head of livestock were looted and killed; and more than 19,000 houses and cave dwellings were burned down.

In the early stage of this anti-mopping campaign, the Jin-Sui Military Region mainly used a portion of its forces to cooperate with local troops and guerrillas in widespread guerrilla warfare. They harassed and contained the attacking enemy, disrupted enemy transportation, and covered the transfer of the masses. The main force avoided the enemy's sharp edge and moved to the outer line to seek opportunities to attack the Japanese army. This describes the classic guerrilla operational pattern: avoid being fixed into a single decisive trap, but create enough friction that enemy operations degrade into a struggle they can't sustain.

repeated attacks and ambushes during the mopping period across Miyu Town and other areas—units striking repeatedly, destroying roads, cutting off enemy transportation, and attacking enemy strongholds north of Dawu. To thwart the Japanese army's plans to build roads and fortifications—plans that would make future sweeps easier—the Jin-Sui Military Region instructed, on December 27, all sub-districts to mobilize forces to disrupt Japanese road construction and fortification. The 358th Brigade attacked enemy road construction from Lanxian to Dashetou and from Puming to Chijianling; the Independent 1st Brigade sabotaged the Dawu–Linxian highway; and the 4th Column of the Death Squad sabotaged the Dawu–Fangshan highway.

Part of the Independent 1st Brigade's 2nd Regiment organized over 2,000 civilians to sabotage the Dawu–Sanjiao highway twice, forcing the enemy in Linxian to detour through Fangshan to contact Lishi. The Lishi guerrillas led civilians in two sabotage attacks on the Lishi–Jundu highway, destroying over 30 "li" of road. Other units attacked strongholds along key highways and destroyed or disrupted the "maintenance committees" that surrounded newly built enemy strongholds. There were also direct raids—storming into Linxian County and capturing representatives of enemy maintenance organizations. Meanwhile, the Workers' and Patriots' Brigade carried out continuous sabotage on the Taifen Highway.

As the enemy plans ran into persistent disruption, Japanese and puppet forces began to retreat in different routes starting January 2, 1941, and by January 24 they returned to their original strongholds. The Jin-Sui winter counter-mopping operation lasted 40 days, annihilated more than 2,500 enemy troops, destroyed 125 kilometers of roads and 23 bridges, and recovered all towns occupied by the enemy during the campaign. Here the stakes show through most clearly: the campaign was not merely about killing enemy troops. It was about preventing the occupier from building a durable, road-connected grid that would allow future sweeps to be faster, larger, and more decisive.

At the wider campaign level, the Eighth Route Army also recorded its total effects from August 20 to December 5, covering roughly three and a half months. During that period, the Eighth Route Army fought 1,824 battles of varying sizes, killing or wounding 20,645 Japanese soldiers (including senior officers), killing or wounding 5,155 puppet troops, and capturing 281 Japanese soldiers and 18,407 puppet troops. 47 Japanese soldiers surrendered voluntarily, and 1,845 puppet troops defected, totaling 46,380 people. The Communists captured 5,942 guns and 53 artillery pieces, and destroyed extensive transportation infrastructure: 474 kilometers of railway, 1,502 kilometers of highway, 213 bridges, 37 railway stations, 11 tunnels, more than 217,000 rails, more than 1,549,000 sleepers, more than 109,000 telephone poles, and more than 424,000 kilograms of telephone wire. Five coal mines and 11 warehouses were destroyed. The narrative further adds that when including casualties of Japanese and puppet forces across related engagements—such as Fuwang and the anti–mopping operations in northwest Shanxi—the total number of casualties reached more than 50,880.

Japanese statistics were also cited for damage assessment, noting destruction of track and bridges across key railways (Zhengtai, Tongpu, Pinghan), telegraph pole damage, power line cuts, and effects on coal production—such as the Jingxing New Mine being unable to produce coal for at least six months. These details underline a broader background stake: infrastructure damage was meant to weaken the occupier's ability to keep its occupation apparatus working, even after the direct battles ended.

The price of that multi-month struggle was high for the Eighth Route Army as well. Over the three and a half months leading up to the Hundred Regiments Offensive, the Eighth Route Army suffered 17,000 casualties, and more than 20,000 were poisoned. During the Hundred Regiments Offensive itself, post-war statistics state that the 129th Division suffered 7,362 casualties and 450 missing persons, and the entire division suffered 7,812 casualties. When you connect these lines—offensive sabotage, counter-offensives, Japanese mopping-ups, and anti-mopping resistance—you see why this second wave of fighting mattered. It wasn't only about whether the Japanese could respond to the offensive. It was about whether both sides could sustain their operational logic: the Japanese trying to stabilize occupation through "mopping," and the Communists trying to preserve base systems through dispersal, harassment, and counter-moves that convert the occupier's clearing effort into something too costly to maintain.

The background of the Hundred Regiments offensive, who authorized it, who planned it, and why, remains unclear. The Japanese response was so severe that, in retrospect, it appeared to some as if the offensive had been a mistake. Some leaders, especially Mao, may have wanted to disavow it. Indirect hints in Mao's writings in subsequent months and years suggest he may have viewed it critically or harbored misgivings from the start. It was not the kind of strategy Mao preferred. More than twenty years later, during the Cultural Revolution, Red Guards charged that Mao had not even known of the plan in advance because of Peng Dehuai's alleged duplicity, at the time, Peng was being denounced.

While this seems unlikely, it may contain some substance. In his own defense against these charges, Peng stated that after the 8RA headquarters—located not in Yan'an but in Jin-Cha-Ji—planned the operation, it sent mobilization orders downward to each regional command and also notified the Central Military Affairs Commission headed by Mao. In the original plan, the action would begin in early September. But, Peng wrote, to prevent enemy discovery and to ensure simultaneous surprise assaults—thereby inflicting an even greater blow to the enemy and the puppets—they began about ten days earlier than scheduled, during the last week of August. "So we did not wait for approval from the Military Affairs Commission (this was wrong), but went right into combat earlier than planned."

There is also the issue of the "spontaneous" participation of more than eighty regiments without authorization from the Eighth Route Army headquarters, and not from Yan'an as well. If Peng Dehuai's account is accepted (written in 1970, shortly before his death), then Mao and Party Central had no role in conceiving or planning the Hundred Regiments campaign. In that case, the "grand strategy" motivations for undertaking it largely vanish—except perhaps insofar as they were considered by Peng and his colleagues. One alleged motive was to counter any tendency toward capitulation by Chiang Kai-shek and the Chongqing regime: if the war heated up and the CCP threw itself into fighting, any accommodation between Chiang and Japan would look like cowardly surrender. A related consideration was the Communist leadership's sensitivity to the charge that they were simply exploiting the war to expand their influence—avoiding Japanese combat while letting KMT armies bear the real burden of fighting. The Nationalists gave major publicity to the accusation that CCP policy devoted 70 percent of effort to expansion, 20 percent to coping with the KMT, and only 10 percent to opposing Japan.

A third suggested motive was to divert attention from the New Fourth Army's offensives against Nationalist forces in Central China, which were peaking around the same time.

Peng Dehuai acknowledged the campaign was "too protracted," yet he defended its importance in maintaining the CCP's anti-Japanese image in the wake of anti-friction conflicts, in demonstrating the failure of the cage-and-silkworm policy, in returning at least twenty-six county seats to base control, and in keeping "wavering" elements in line. Even if these reasons mattered less than regional and tactical calculations in launching the campaign, they could always be used for propaganda afterward. Whatever misgivings Mao and Party Central may have had, the Party kept them to itself. Mao radioed congratulations to Peng after his victory, and in public statements the Hundred Regiments were turned into legend.

Even if the Hundred Regiments campaign aimed to defeat Japanese pacification efforts, it did not succeed in a decisive way. Shocked and stung by the 8RA's action, the North China Area Army intensified its efforts to bring North China under tighter control. Under General Tada and then his successor, General Okamura Yasuji (July 1941–November 1944), the Japanese inflicted brutal, sustained violence against all North China bases. Between 1941 and 1944, about 150,000 Japanese troops were assigned full-time to pacification duty, supported by roughly 100,000 Chinese auxiliaries of widely varying description and effectiveness. The remainder of the NCAA (about 150,000–200,000 men) was assigned to other tasks such as garrisoning major cities and containing Nationalist forces. Communist regulars were estimated at around 250,000 within base areas and 40,000 in SKN.

The Japanese and their Chinese auxiliaries invested even more heavily than before in constructing moats, ditches, palisades, and blockhouses. Japanese sources claimed that by 1942 their forces had built 11,860 kilometers of blockade line and 7,700 fortified posts, mostly in the Hebei plains and the foothills of the Taihang mountains. A massive trench ran for 500 kilometers along the western side of the Pinghan railway line, with a depopulated and constantly patrolled zone on either side. The 250 Japanese outposts established in southern Hebei by December 1940 were more than quadrupled by mid-1942. These became the key means of controlling plains areas; by the end of 1941, all Communist bases in such terrain had been reduced to guerrilla status. Many main force units—such as those under Liu Cheng'ao and Yang Xiufeng—were compelled to move westward into mountains to survive.

What distinguished the new Tada–Okamura approach from earlier tactics was the much larger and more protracted search-and-destroy thrust into the core mountain-base areas. They also replaced selective repression with indiscriminate, generalized violence. These infamous "Three-All" mop-up campaigns meant: kill all, burn all, loot all. Unable to distinguish ordinary peasants from Communists, the Japanese waged war on everyone. After attempting to seal off major consolidated regions in the base areas, they sent in very large detachments to search for Communist forces, civilian cadres, and activists. They also tried to destroy base facilities and war material stockpiles; to disrupt agriculture by burning crops or interfering with planting and harvesting; and to seize grain stores. Entire villages were razed, and everything alive found there was killed.

Unlike earlier mop-ups that swept through an area and then departed, these campaigns left troops in the targeted zones for extended periods, "combing" the area back and forth and building at least temporary strongpoints in more accessible parts of mountain bases. These mop-up operations took a heavy and painful toll on rural populations. No doubt the harsh tactics and atrocities frequently committed during these actions did cause many peasants, rich and poor alike, to harbor deep hatred of the Japanese and to commit more fully to the Communist side. But intra-party sources also portray cases in which repression worked even more effectively than earlier attempts to drive a wedge between party and peasantry. As one internal assessment put it:

If we only stress concealment… we are bound to be divorced from the masses.
The morale of the masses cannot be sustained for long either.
On the other hand, if we only seek fleeting gratification in careless fighting, we may also invite still more cruel enemy suppression. That will also alienate the masses.

Communist spokesmen acknowledged that, in North China base areas, the population under Party control fell from 44 million to 25 million, while the Eighth Route Army declined from 400,000 to 300,000. Local records present an even grimmer picture. By 1942, 90 percent of the plains bases had been reduced to guerrilla zones or outright enemy control. In the mountainous Taiyue district within the Jin-Cha-Lu-Yi base, one cadre admitted that "not a single county was kept intact and the government offices of all its twelve counties were exiled in Jin-yuan." All twenty-six county seats occupied following the Hundred Regiments fighting were lost.

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Japan tried to regain control through retaliatory "mopping-up" operations starting in October 1940. In response, the Eighth Route Army and its commanders issued counter-measures: coordinate party, government, military, and civilians; keep mobility while dispersing forces when possible; and focus on annihilating incoming enemy units decisively. Counter-sweeps and anti-pacification actions continued through December, involving repeated ambushes and sabotage of roads, highways, and fortification efforts.