War Overview · Northern Expedition (1926–1928)

A revolutionary army of fewer than 200,000 men fought its way out from Guangdong and, in two and a half years, broke or absorbed the three great northern warlord groupings, nominally unifying China beneath a single flag -- while the revolutionary camp itself tore apart midway, making the endpoint of this war also the starting point of the KMT–CPC Civil War.

Engagement Data

Belligerents (War Level)

The troop figures on both sides are unreliable: the Beiyang forces were large on paper but had limited combat-capable troops, while after rolling absorption the Northern Expeditionary Army's statistical basis became confused.

Situation

World: under the post-First World War Versailles-Washington system, the powers' pattern of interests in China was being reorganized; the Soviet Union treated revolution in the East as an outward direction and intervened deeply in Chinese politics through the Communist International; Japan swung between Shidehara diplomacy and Tanaka hardline policy, while interests in Manchuria and Mongolia were treated as a lifeline.

China: the tenth year of warlord conflict. After Yuan Shikai's death, Beiyang broke into the Zhili, Anhui, Fengtian, and other factions; the Beijing government changed cabinets more than ten times in ten years (specific number unverified), while military disaster, extortionate levies, forced labor, and grain requisitions spread across the North and the Yangtze valley. In 1925, the May Thirtieth Movement and the Canton-Hong Kong Strike turned "down with the imperialist powers, eliminate the warlords" from a slogan into a street movement, and the *National Revolution Song* was sung across the country to an older melody (one account traces the tune to a French children's song; unverified) -- this was the social soundtrack when the Northern Expedition set out.

Guangdong base area: in 1924, the First National Congress of the KMT reorganized the party, allied with Russia, and admitted Communists, who joined the KMT in an individual capacity; Whampoa built the army, two Eastern Expeditions defeated Chen Jiongming, Yunnan and Guangxi troops were pacified, and Guangdong was unified. By 1926, this was the only base area in all China with a doctrine, an army, and tax revenue -- the entire capital of the Northern Expedition lay here.

Three opponents: Wu Peifu held Hunan-Hubei and Henan; the old aura of the "Jade Marshal" remained, but years of defeats had already damaged his vitality. Sun Chuanfang held the five southeastern provinces of Jiangsu, Zhejiang, Anhui, Jiangxi, and Fujian, styling himself commander-in-chief of the five provinces. Zhang Zuolin held the Northeast and Beijing-Tianjin, the last and largest block. The Northern Expedition's strategy was defeat in detail: first Wu, then Sun, finally Zhang.

Why It Was Fought

The Constitutional Protection War had become a stalemate. By 1926, the only force still able to move was the Guangdong base area -- its origins have already been laid out above; here the question is only how it became an army marching north.

In the first half of 1926, two events cleared the threshold for sending troops: after the March Zhongshan Warship Incident and the May Party Affairs Reorganization Case, military authority was concentrated in Chiang Kai-shek's hands; Soviet arms reached Guangdong by sea, advisers had entered the game, and fiscal reorganization had produced revenue. In June, a KMT Central Committee meeting passed the resolution to launch the Northern Expedition and appointed Chiang Kai-shek commander-in-chief (meeting session and resolution date unverified); on July 9, Guangzhou held the oath-taking ceremony.

Why now? The opening was given by the opponents. The three great northern warlords were biting one another: Wu Peifu's core main force was pinned on the Nankou line fighting Feng Yuxiang's Guominjun, with Wu supervising operations at Changxindian and unable to look south; Sun Chuanfang sat watching from his five southeastern provinces, calculating that once the southern army and Wu's army had both suffered, he would come down and clean up the Yangtze; Zhang Zuolin was farthest away, watching the fire from across the river. Guangzhou saw this clearly, so the strategy before troops were even sent was defeat in detail: stabilize Sun Chuanfang and strike Wu Peifu first (original planning documents and meeting records unverified). The later course of the war largely followed this script not because the script was brilliant, but because the three opponents made three separate calculations, and none was willing to send troops first for another man's sake.

Nor was there no dissent. Within the CPC, Chen Duxiu at this time held reservations about the Northern Expedition; in July he published articles discussing it, was accused of taking a passive attitude and of being wary of military centralization, and received criticism from within the party and from the Communist International (the articles' intent and the degree of criticism are interpreted differently by different scholars; source unverified) -- this was the only formed dissent left on paper before troops were sent. It was not adopted: a single corner of Guangdong could not support a standing army, and if it waited, both finances and morale would be trapped to death in the Pearl River Delta (this judgment is inferred from the base area's fiscal structure, with no direct record; unverified). The dissent remained on paper; the army crossed the provincial border.

The material boundary was drawn just as clearly. The entire store of assets consisted of one province's tax revenue, Soviet firearms shipped in by sea, and cadres trained at Whampoa, enough to form eight armies; the opponents were three families of old armies totaling several hundred thousand men. Every round of ammunition fired was one less, and replenishment could only come by feeding war with war -- with every city taken, funds were raised locally, units absorbed, and public bonds issued; the army was like a snowball, and also like a household living on debt (detailed military revenue and expenditure for each stage unverified). Artillery was the short plank from beginning to end, and that boundary appeared all along the road: fight mobile warfare if mobile warfare was possible, avoid assaults on fortified positions if they could be avoided, absorb where absorption was possible, and when a fortified city had to be taken, fill the gap with human lives.

On the Beiyang side there was no center -- the other half of why the Northern Expedition could succeed. Wu Peifu underestimated the southern army, thinking his Hunan-Hubei forces were enough to handle it while his core forces stayed in the North and did not return. Sun Chuanfang's "neutrality" was a carefully calculated misjudgment: what he wanted was not peace but profit from the struggle; by the time he understood, Wu's army had already collapsed beyond recovery. Each man's judgment, taken alone, was not stupid. The trouble was that three pieces of clarity added together arranged the order of battle exactly for the Northern Expeditionary Army.

The entry point fell in Hunan. In the spring of 1926, Tang Shengzhi drove out Zhao Hengti and set himself up independently; Wu Peifu supported Ye Kaixin in attacking Tang. Tang retreated to Hengyang and asked Guangzhou for aid -- aiding Tang was the Northern Expedition: in May, Ye Ting's Independent Regiment and other advance units entered Hunan; in July, the main army followed. A long-planned war of unification opened as a relief operation.

Course of the Engagement (Stage Table)

The Revolutionary Camp Tears Itself Apart

When the Northern Expedition reached the Yangtze valley, the internal fissure inside the revolutionary camp burst open publicly -- this was the greatest turning point of the whole war, more decisive for China's direction than any single battle.

• The fissure had long existed: alliance with Russia and admission of Communists was an alliance of expediency. In the 1926 Zhongshan Warship Incident (3.20) and the Party Affairs Reorganization Case, Chiang Kai-shek had already begun restricting Communist activity inside the KMT; during the Northern Expedition, worker and peasant movements spread like wildfire in Hunan-Hubei and Jiangxi, land and labor-capital conflicts intensified, and fear deepened on the KMT right.
• 1927.4.12 April 12: Chiang Kai-shek purged the party in Shanghai; Green Gang armed men attacked workers' pickets, and Communists and worker-movement cadres were then arrested and killed, with the dead numbering from several thousand to over ten thousand depending on the basis used (unverified; two accounts coexist)※. The Nanjing National Government was established immediately afterward.
• Ninghan Split and reunion: the Wuhan National Government for a time opposed Chiang by launching an eastern expedition against him; Feng Yuxiang mediated, and with economic blockade in the Wuhan jurisdiction and an internal rightward turn, Wang Jingwei "split with the Communists" on 1927.7.15 -- after July 15, Ninghan gradually moved toward reunion (September special committee; details unrecorded).
• Consequence: the First United Front broke down completely. The Communists went underground and moved toward armed uprisings (Nanchang Uprising, 1927.8.1), and the KMT–CPC Civil War began from here -- this article closes at this point and connects onward to the Agrarian Revolutionary War articles.
• The Soviet role turned at the same time: Borodin, Galen (Blyukher), and other advisers left China after the split with the Communists; Stalin blamed the failure on CPC "right deviation," and Chen Duxiu fell from power within the CPC -- KMT-CPC relations and internal struggles in the Soviet Communist Party were entangled together, and causal narratives here diverge greatly among scholars, so this enters the "Disputes" section.

Two Insertions by External Powers

• Nanjing Incident (1927.3.24): when Northern Expeditionary troops entered Nanjing, looting of foreign consulates and foreign casualties occurred; British and American naval guns shelled Nanjing, causing Chinese military and civilian casualties (the two sides give separate casualty bases; unverified) -- a direct appearance of the powers' gunboat policy within the Northern Expedition; details cross-reference the later separate article.
• Jinan Massacre (1928.5.3–): as the Second Northern Expedition reached Jinan, Japanese forces sent troops into Shandong and clashed with the Northern Expeditionary Army, massacring several thousand Chinese soldiers and civilians and torturing to death diplomatic personnel including Cai Gongshi (figures vary by basis)※. The Northern Expeditionary Army detoured north. This was a rehearsal for full-scale Sino-Japanese war ten years later; details cross-reference the later separate article.

Second Northern Expedition and Nominal Unification (1928)

In early 1928, Chiang Kai-shek returned to office, and the four groupings of Chiang, Feng Yuxiang, Yan Xishan, and Li Zongren jointly launched the Second Northern Expedition. Fengtian forces abandoned Beijing-Tianjin; in June, Yan Xishan's forces entered Beijing, which was renamed Beiping. On 6.4, Zhang Zuolin's special train was destroyed at Huanggutun by explosives pre-planted by the Kwantung Army, and he died of his wounds -- young Japanese officers had directly killed the puppet their own government intended to protect. On 12.29, Zhang Xueliang telegraphed the Northeast's change of flag, and nominal national unification was achieved.

The weight of nominal unification needs to be written realistically: the four groupings absorbed old units and each held territory; the Demobilization and Reorganization Conference (1929) broke down over army reduction, and the Chiang-Gui, Chiang-Feng, and 1930 Central Plains War soon followed -- unification existed on paper, and division continued in another form. This leads into the articles on the warlord wars.

Casualties and Losses

• Northern Expeditionary Army: the total casualty basis for the whole war is confused; in the Jiangxi campaign alone (1926.9–11), losses reached several tens of thousands, the heaviest since the war began (army archives and later military histories differ widely; several accounts coexist).
• Beiyang forces: the combined losses of the factions were far greater than those of the Northern Expeditionary Army, but most disappeared through rout, absorption, and change of flag, making "casualties" and "disintegration" difficult to separate statistically.
• ※ Civilians: forced labor, grain requisition, and local fund-raising were common in the war zones; during the forty-day Siege of Wuchang, food in the city ran out and many civilians starved to death (see separate article); plunder and disturbance by routed troops and during absorption are scattered through local gazetteers and newspapers, with no total account. As usual, the main cost of war fell on heads without unit designations.

Aftermath

• The National Government fixed its capital at Nanjing and entered the period of "political tutelage"; the military-political legacy of the Northern Expedition -- party leadership over government, and military control over the party -- became the skeleton of China's political order for the next twenty years.
• The Communists changed from allies inside the system into wanted rebels, and the Agrarian Revolutionary War began -- one of the Northern Expedition's earliest organizers was no longer on the list of its victors.
• Japan's designs on the Northeast accelerated instead because of Zhang Zuolin's death and Zhang Xueliang's change of flag; three years later came September 18.
• The Beiyang warlords as a whole exited history, but warlord politics did not -- only the list changed into new uniforms.

How Each Side Records It

• National Revolutionary narrative (the Northern Expeditionary Army's own): a National Revolution to "down with the imperialist powers, eliminate the warlords," a righteous army unifying China; Whampoa spirit, the legend of the Iron Army, and people bringing food and drink to welcome the troops formed a golden chapter in official KMT historiography.
• Beiyang side and local memory: in old-style memory, Wu Peifu in his later years did not go abroad and did not serve puppet regimes, so the "defeated general" retained a personal integrity; Sun Chuanfang was assassinated in 1935 by Shi Jianqiao in revenge, adding a folk-story color to the Beiyang ending. Local memories in the war zones are more often of military disaster: forced labor, grain requisitions, routed troops passing through; every army forced laborers, and whoever won demanded grain.
• Two later KMT and CPC narratives, side by side: the Communist narrative stresses that worker and peasant movements were the foundation of the Northern Expedition's victory, that Communists (including Ye Ting's Independent Regiment) fought in the vanguard and sacrificed most heavily, and that the KMT right betrayed the revolution midway; the KMT narrative stresses military unification and the realization of Sun Yat-sen's teachings, frames the party purge as "protecting the party and saving the nation," and calls the worker and peasant movements "excessive." Both narratives hold part of the historical facts.

Disputes and Sensitivities

• Number of April 12 dead: figures from several thousand to several tens of thousands coexist by different bases; the characterization of the "party purge" (protecting the party vs. betrayal) remains a dividing line between historical views across the Taiwan Strait.
• Merits and faults of Soviet intervention: Soviet aid and advisers were one of the conditions for the Northern Expedition's military victory, and at the same time a structural cause of the KMT-CPC rupture; whether Stalin's China directives were right or wrong touches the respective narratives of Soviet Communist Party history and CPC history.
• Evaluation of worker and peasant movements: the contest between characterizing them as "transgression" or as "revolution" is directly tied to the legitimacy of both parties.
• Northern Expedition and "unification": the tension between nominal unification and substantive division is the pivot judgment linking this article to the warlord-war articles and the Central Plains War article.
• The Northern Expeditionary Army itself was not without blemish: disciplinary problems brought by absorbing old warlord units, and disturbances caused by assault troops and routed soldiers, are recorded in the separate articles.

Contents

The Battles of Shanghai and Nanjing, the Nanjing Incident, April 12, the Jinan Massacre, the Huanggutun Incident, and others have separate articles to be written. Entry into Hunan and the Fujian-Zhejiang advance are included in this article and do not become separate articles.

汀泗桥与贺胜桥1926.08吴佩孚在武汉南大门摆了两道硬阵，国民革命军第四军四天之内连砸两道——两湖战局就此定盘，第四军从此叫"铁军"。南昌之战（1926）1926.09北伐军两度攻入南昌两度折戟，第三度合围总攻才把这座城拿下来——东南五省联帅孙传芳的主力就葬送在江西，而北伐军也付出了开战以来最重的伤亡。武昌围城1926.09吴佩孚的最后主力缩进武昌坚城死守四十天，两次蚁附攻城在城墙下堆起尸体，最后城是围垮的——而围城四十天的饥饿，主要落在城里几十万平民头上。上海南京之战（1927，含南京事件）1927.02上海是工人起义配合大军兵不血刃拿下的，南京是打下来的——克城次日英美军舰炮击下关，市民死伤枕藉；再过半个月，革命阵营在上海对自己人举起了枪。河南之战（1927）1927.04宁汉分裂之下，武汉方面独力北伐河南，与南下的奉军硬碰硬打了一个月，会师郑州——仗打赢了，武汉的军事本钱也打薄了，会师的果实落进了冯玉祥口袋。龙潭战役1927.08蒋介石刚下野、宁汉正对峙，孙传芳六万大军趁虚夜渡长江，扑到南京眼皮底下的龙潭——七天血战，渡江之敌几乎全灭；南京政权最接近覆灭的一次，也是孙传芳最后的一把梭哈。二次北伐（含济南惨案）1928.04四个集团军会攻京津，军事上几乎没有悬念——真正被记住的是路上的两件事：日军在济南屠戮军民逼北伐军绕道，关东军在皇姑屯把张作霖连人带车炸上了天。中国人的统一战争，两次被日本人插进来改写。

Sources and Open Questions

Main sources (proposed verification paths):

• Northern Expedition archives held by the KMT Party History Commission; *Military History of the Northern Expedition* (Taiwan official edition)
• Volumes on the Great Revolution period from the CCP History Publishing House; military-history materials related to Ye Ting's Independent Regiment
• Soviet side: Cherepanov, *The Northern Expedition of the Chinese National Revolutionary Army*; selected Communist International archives
• Contemporary newspapers: *Shen Bao* and *Ta Kung Pao* war-zone reporting, 1926–28

Open questions: the different bases for both sides' troop strengths; chronological details of the engagements entering Hunan; the concrete process of the Fujian-Zhejiang change-of-flag advance; the various bases for the number of April 12 dead; casualties on both sides in the Nanjing Incident; number of dead in the Jinan Massacre; casualties in the Jiangxi campaign; concrete procedures of Ninghan reunification; tune lineage of the *National Revolution Song*; number of Beijing government cabinet changes; meeting session and resolution date for the resolution to launch the Northern Expedition; original planning documents for the first-Wu-then-Sun strategy; the text of Chen Duxiu's Northern Expedition articles and the process of criticism against them; the relationship between Guangdong's fiscal structure and the decision to send troops; routes and quantities of Soviet munitions; detailed military revenue and expenditure for each stage.