|Part of Warlord Era|
Clockwise from top-left: Chiang inspecting soldiers of the National Revolutionary Army; NRA troops marching northwards; an NRA artillery unit engaged in a battle with warlords; people showing support for the NRA; peasants volunteer to join the expedition; NRA soldiers preparing to launch an attack.
|Commanders and leaders|
| Chiang Kai-shek
| Du Xigui
V.K. Wellington Koo
|about 250,000||about 800,000|
|Literal meaning||National Revolutionary Army northern expedition|
The Northern Expedition was a military campaign launched by the National Revolutionary Army of the Kuomintang (KMT), also known as the Nationalists, against the Beiyang government and other regional warlords in 1926. The purpose of the campaign was to reunify China, and the expedition was divided into two phases. The first phase was interrupted by the political split in the Kuomintang following the formation of the Nanjing faction in April 1927 against the existing faction in Wuhan. The split was partially motivated by the purge of the Communists within the party, which marked the end of the First United Front, and Chiang Kai-shek briefly stepped down as the commander of the National Revolutionary Army.
The campaign was resumed in January 1928 with the return of Chiang to the commanding post, and the Nationalist forces advanced to the Yellow River by April 1928. Strings of victories by the Nationalists toward Peking, with the assistance of allied warlords including Yan Xishan and Feng Yuxiang, forced Zhang Zuolin of the Fengtian clique out of the capital city. Zhang was assassinated shortly after by the Kwantung Army on his way back to Manchuria, and his son Zhang Xueliang took over as the leader of the Fengtian clique. In June 1928, Zhang Xueliang announced Manchuria would be accepting the authority of the Nationalist government in Nanjing, effectively ending the Northern Expedition.
Since the Constitutional Protection Movement ended in 1922, the Kuomintang (KMT) had been expanding in Guangdong to prepare for an expedition against the Northern warlords in Peking and reunifying China. The preparation required improving both the political and military strength of the KMT. Before his death in March 1925, Sun Yat-sen was supportive of Sino-Soviet cooperation, which involved forming the First United Front with the Communist Party of China (CPC). The Whampoa Military Academy was opened in 1924, with Chiang Kai-shek appointed as the commandant, having emerged as the protégé of Sun since 1922.
On 30 May 1925, Chinese students in Shanghai, supported by the KMT, gathered together and held anti-foreign demonstrations in the International Settlement. The movement sparked popular unrest throughout the country. Chiang emerged from the party ranks in the KMT as the paramount leader, and consolidated his power further through the Canton Coup, in which several top Communist leaders in the KMT were arrested between 18 and 19 March 1926.
Immediately prior to the expedition, there were three major coalition of warlords across China that were hostile toward the Kuomintang. The forces of Wu Peifu occupied Hubei, Henan and northern Hunan province. The coalition of Sun Chuanfang was in control of Fujian, Zhejiang, Jiangsu, Anhui and Jiangxi province. The most powerful coalition was led by Zhang Zuolin, head of the Beiyang government and the Fengtian clique, in control of Manchuria, Shandong and Hebei province.
First phase (July 1926 – March 1927)
On 9 July 1926, the Kuomintang ceremonially appointed Chiang Kai-shek as the commander of the National Revolutionary Army (NRA), which officially launched the expedition. In a military conference at Changsha on 11 August, the Nationalists decided to bypass Nanchang and attack Wuchang straight away. The warlord defense led by Wu Peifu collapsed on 31 August in which Wu only narrowly fled, and the revolutionary forces reached the heavily fortified Wuchang on 31 August. The city garrison surrendered on 10 October after more than a month of military blockade, and the NRA had secured the Hubei province as Wu and his remaining troops fled to Henan. The NRA then diverted their forces toward the territories of Sun Chuanfang, which included both Nanchang and Jiujiang in Jiangxi, capturing both provinces in the process. On 18 December, He Yingqin led two divisions of the NRA and captured Fuzhou, the provincial capital of Fujian. In the short span of six months, the Nationalists had expanded to seven provinces, controlling a population of "approximately 170 million". Sun Chuanfang retreated to Nanjing in the aftermath of major setbacks. The Fengtian clique responded to the request for help from Sun by reinforcing Jiangsu and Anhui, while increasing the number of troops in Henan in support of Wu Peifu. The NRA was able to defeat the alliance, and on 23 March 1927, the Nationalist forces marched into Nanjing.
As part of the alliance, many members of the Communist Party joined the Kuomintang and exerted significant influence over the left wing faction of the KMT. Between 12 to 14 April, hundreds of Communists in Shanghai were arrested and killed by the order of Chiang, effectively ending the alliance between the Nationalists and the Communists. The purge was condemned by the left wing faction of the KMT led by Wang Jingwei in Wuhan, and this led to the internal split between the KMT based in Wuhan and the KMT based in Nanjing.
The Northern Expedition was temporarily put on hold after the capture of Nanjing. Chiang Kai-shek proposed to several top KMT officials in Wuhan to "discuss party unity". To "heal the rift" between the Nanjing and Wuhan factions, Chiang offered to voluntarily step down from his leadership role, allegedly influenced by Bai Chongxi. Wang Jingwei, having recently returned to China, took the leadership role in the Wuhan faction and began purging Communist members of the KMT in Wuhan. The CPC responded by staging several successful attacks that politically and militarily weakened the KMT in Wuhan significantly, notably in Nanchang.
The chaos in the immediate aftermath of the Communist purge in April allowed Sun to regroup and began launching new offensives with Zhang Zongchang. With the Nationalists fighting the war on two fronts, Sun was able to attack and recapture Xuzhou on 24 July. However, Sun's forces were decisively defeated by the NRA on 30 August in battles around Longtan[disambiguation needed], and Sun ended up having "escaped" north of the Yangtze River. The Nationalist forces continued to advance northwards and recaptured Xuzhou on 16 August. With the military success of Chiang's Whampoa troops, the factions within the KMT agreed to recognize the legitimacy of Chiang's leadership and the Nanjing government as long as their regional sphere of influence continued to be permitted. Consequently, Chiang soon returned to the commanding post in January 1928.
Second phase (May 1927 – June 1928)
With Chiang returning as the commander, the expedition was soon to be resumed. The Nationalist summer offensives of 1927 recaptured most of the territories lost to the warlords during the hiatus. Facing the Nationalist advance, Zhang Zuolin assembled the "National Pacification Army" known as Anguojun to defend against the National Revolutionary Army. By April 1928, the Nationalist forces have reached the Yellow River, threatening Peking directly.
As the NRA was passing by Shandong province in May, the Imperial Japanese Army stationed in Jinan intervened on 3 May, violently killed NRA representative Cai Gongshi and other Chinese diplomats from the KMT, while opened fire and killed "approximately five thousand" Chinese civilians. This armed conflict is what came to be known as the Jinan Incident.
March to Peking
In the meanwhile, Shanxi warlord Yan Xishan decided to change side to form an alliance with the Nationalists and began marching toward Peking. Combined with the recent announcement that Japan will recognize the legitimacy of the Nationalists as the representative of China, Zhang Zuolin decided to retreat, but he was assassinated on his way back to Manchuria by operatives from the Japanese Kwantung Army in the Huanggutun Incident. Zhang Xueliang succeeded as the new leader of the Fengtian clique, and he declared his allegiance to the Nationalist government in Nanjing on June 1936, marking the official end of the Northern Expedition.
While the reunification of China was achieved on the surface, the country "remained divided along regional lines". After the capture of Peking, Chiang held a conference with Feng Yuxiang, Yan Xishan, Bai Chongxi and Li Zongren in July 1928. As Chiang attempted to cut back the military and centralize the power of the Nationalist government in Nanjing, the regional warlords, with their military strengths largely preserved, quickly renounced their allegiance to Chiang and formed an alliance against the Kuomintang. The struggle for supremacy soon broke out into the Central Plains War in 1930. Although Chiang emerged once again as the paramount leader of China with his decisive victory in the war, the problem of both regionalism and warlordism continued to persist in the KMT, and these problems played a significant role in the Chinese Civil War.
In the Soviet Union
The Northern Expedition in China became a point of contention over foreign policy between Joseph Stalin and Leon Trotsky in the Soviet Union. Stalin encouraged the CCP to cooperate with the KMT on multiple occasions, as he believed the KMT was more capable of completing the Chinese revolution. Trotsky was opposed to the KMT as he believed the party was against the concept of proletarian revolution. The Comintern was in support of Stalin's decision to financially support the KMT.
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- Media related to Northern Expedition at Wikimedia Commons