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How did the Northern Expedition and the consolidation of Chiang Kai-shek's power transform China between 1926 and 1928?

The Northern Expedition 1926 to 1928 and the consolidation of Chiang Kai-shek's Nationalist government, including the role of the First United Front, the Whampoa Military Academy, the alliance with the warlords, and the establishment of the Nanjing decade

A focused answer on the Northern Expedition (1926-1928), the rise of Chiang Kai-shek, the Whampoa Military Academy, the role of the First United Front, and the establishment of the Nanjing Nationalist Government. Covers strategic events including the Hankou and Nanjing incidents, Soviet Russian and Comintern involvement, and the historiography of Jonathan Fenby, Hans van de Ven, and Jay Taylor.

Generated by Claude Opus 4.810 min answerUpdated 2026-06-27

Reviewed by: AI editorial process; not yet individually human-reviewed

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What this dot point is asking

NESA expects you to explain how the Northern Expedition (1926-1928) unified China militarily, how Chiang Kai-shek used it to make himself the dominant figure in the Guomindang (KMT), and how the campaign laid the foundations for the Nanjing Decade. Strong answers integrate the First United Front, the Whampoa Military Academy, the Soviet role, and the violent end of the alliance with the Communists.

In plain English

By the mid-1920s China had no real central government. Since 1916 the country had broken into territories run by "warlords" - regional strongmen with private armies. The Nationalists (KMT) controlled only one province in the south, around the city of Guangzhou.

Think of a country carved up by rival gangs, where one ambitious group decides to march out from its home turf and take over the whole map. To do it, the KMT made two deals. It borrowed muscle and weapons from the Soviet Union, which also set up a military school (Whampoa) to train officers - Chiang Kai-shek ran it. And it teamed up with the small Communist Party (the "United Front"), whose organisers stirred up farmers and factory workers to sabotage the warlords from behind the lines. The combined push, the Northern Expedition, swept north from 1926 and reached Beijing by 1928.

Then Chiang double-crossed his partners. In 1927 he turned on the Communists and slaughtered them, and instead of beating the remaining warlords he let them keep their armies if they flew his flag. So China looked united on paper, but it was really a patchwork of deals - a bit like a company that "merges" with its rivals but lets each branch keep running itself however it likes.

The answer

China on the eve of the Expedition

After Yuan Shikai's death in 1916, China fragmented into warlord fiefdoms. By 1926 perhaps a dozen major militarists controlled regions: Wu Peifu in the central Yangtze, Sun Chuanfang in the lower Yangtze, Zhang Zuolin in Manchuria. The KMT, refounded by Sun Yat-sen in 1919, held only Guangdong province.

Sun's First United Front policy, formalised at the First KMT Congress (January 1924), accepted CCP members as individuals into the KMT and welcomed Soviet support. The Comintern adviser Mikhail Borodin reorganised the KMT on Leninist lines. General Vasily Blyukher (alias Galen) trained the new army.

The Whampoa Military Academy

Whampoa opened on 1 May 1924 on an island ten miles below Guangzhou. Chiang Kai-shek, freshly returned from Moscow, was commandant. Zhou Enlai directed political instruction. By 1926 the Academy had produced four classes totalling around 5,000 cadets, the officer corps of the new National Revolutionary Army (NRA).

Sun Yat-sen died on 12 March 1925. The KMT leadership split into a left wing under Wang Jingwei and a right wing around Chiang. Chiang's command of the army gave him the decisive advantage.

The Northern Expedition begins

Chiang launched the Expedition on 9 July 1926 with around 100,000 NRA troops. The strategy combined three columns: a left along the Yangtze toward Wuhan, a centre toward Nanchang, and a right toward Fujian and Shanghai.

By October 1926 the NRA had taken the Wuhan tri-cities (Wuchang, Hankou, Hanyang). By March 1927 Shanghai and Nanjing had fallen. Peasant unions and labour unions, organised by CCP cadres, paralysed warlord rear areas. Mao's "Report on an Investigation of the Peasant Movement in Hunan" (February 1927) recorded peasant associations of around two million members.

The Hankou and Nanjing incidents

Anti-foreign violence accompanied the advance. The Hankou incident (3 January 1927) saw Chinese crowds force the British to surrender their concession. The Nanjing incident (24 March 1927) saw NRA soldiers attack foreign consulates and kill six foreigners; British and American gunboats shelled the city. These incidents alarmed both Western powers and Chinese business elites and pushed Chiang toward a settlement with Shanghai capital.

The split in the KMT

The KMT left, led by Wang Jingwei, set up a government at Wuhan in early 1927 alongside Borodin and the CCP. Chiang based himself at Nanchang, then Shanghai. The April 1927 Shanghai Massacre (treated in the next dot point) shattered the United Front. By July 1927 Wang Jingwei had also expelled the Communists. The Nationalist Government was formally proclaimed at Nanjing on 18 April 1927.

Completing the Expedition

The second phase, after a pause, resumed in April 1928. Chiang allied with the northern warlords Feng Yuxiang and Yan Xishan, who defected to the KMT in return for autonomy. Beijing fell on 8 June 1928 and was renamed Beiping (Northern Peace). The Manchurian warlord Zhang Zuolin was assassinated by the Japanese Kwantung Army (4 June 1928); his son Zhang Xueliang declared allegiance to Nanjing on 29 December 1928.

China was, on paper, unified for the first time since 1916.

The Nanjing decade begins

The new state took form rapidly. The Five Yuan Constitution (October 1928) created the executive, legislative, judicial, examination, and control branches. Tariff autonomy was recovered by treaty (July 1928). The Central Bank of China was founded (November 1928). Sun Yat-sen's body was moved to the new mausoleum at Purple Mountain (June 1929).

But the unity was fragile. The Central Plains War (May to November 1930) saw Feng, Yan, and Wang Jingwei rebel against Chiang; perhaps 300,000 men died. Manchuria remained under Zhang Xueliang. Communist base areas in Jiangxi expanded. The 1928 settlement bought form, not substance.

Timeline 1924-1928

Date	Event	Significance
Jan 1924	First KMT Congress, United Front	CCP enters KMT
1 May 1924	Whampoa opens	Officer corps for NRA
12 March 1925	Sun Yat-sen dies	KMT splits left/right
9 July 1926	Northern Expedition launched	Unification begins
Oct 1926	Wuhan tri-cities fall	NRA reaches Yangtze
March 1927	Shanghai and Nanjing taken	KMT controls south
12 April 1927	Shanghai Massacre	End of First United Front
18 April 1927	Nanjing Government proclaimed	New capital
8 June 1928	Beijing falls	China nominally unified
29 Dec 1928	Zhang Xueliang submits	Manchuria nominally KMT

Historiography

Jay Taylor (The Generalissimo, 2009) presents the Expedition as a real state-building achievement that prefigured the Nanjing Decade, while acknowledging the price paid in the 1927 purge.

Hans van de Ven (War and Nationalism in China, 2003) argues Chiang was a competent moderniser whose state-building has been underrated by Maoist and Western-leftist historiography.

Jonathan Fenby (Generalissimo, 2003) is sharper on the corruption, the warlord bargains, and the limits of the unification.

Lloyd Eastman (The Abortive Revolution, 1974) emphasises the structural weaknesses that the Expedition's compromises bequeathed to the Nanjing Government.

Edward McCord (The Power of the Gun, 1993) explains the speed of the advance through Chiang's combination of military defeat and political co-option, incorporating defeated and defecting warlord units rather than destroying them.

How to read a source on this topic

Sources include Soviet adviser reports (Borodin, Blyukher), KMT election posters, Mao's Hunan Report, foreign newspaper coverage (North China Daily News, The Times), and photographs of the Northern Expedition columns. Three reading habits.

First, separate the military advance from the political settlement. The Expedition moved fast partly because warlords defected rather than fought. The "unification" of 1928 absorbed Feng, Yan, and Zhang Xueliang on their own terms.

Second, treat Mao's Hunan Report as a partisan source. It describes real peasant mobilisation but argues a CCP case for accelerating rural revolution against Borodin's caution.

Third, watch dates around April 1927. Wuhan and Nanjing were rival KMT governments for three months. The Shanghai purge dates to 12 April, the Nanjing Government to 18 April, the Wuhan break with the CCP to July.

Model exam responses

A. Source response (5 marks). Source: a 1926 Soviet adviser's report describing the Nationalist advance as driven by peasant unions cutting warlord supply lines and by local commanders defecting. Assess the usefulness of this source for a historian studying why the Northern Expedition advanced so quickly.

As an internal report by a Soviet adviser (origin), the source carries authority on a Soviet-backed campaign but also a motive to emphasise mass mobilisation, the Comintern's own strategy. It is highly useful for explaining the speed of the advance: it identifies the two engines historians stress - CCP-organised peasant and labour unions paralysing warlord rears (Mao's Hunan Report of February 1927 recorded around two million members) and the defection of warlord commanders rather than pitched battle. Its limitation is perspective: by foregrounding mobilisation it may understate the Soviet weapons and the Whampoa-trained officer corps that gave the NRA its cutting edge, and it cannot anticipate how fragile the coalition was - within months Chiang would purge the very Communists it credits. Used critically, the report is strong evidence for the United Front engine of the advance, weaker on the military and political factors that decided what the advance became.

Marker's note: a top response states origin and motive, separates what the source is useful FOR (mobilisation and defection) from what it underplays (Soviet arms, the coming split), anchors this in dated own knowledge, and ends in a judgement rather than paraphrasing the source.

B. Essay paragraph (from a 25-mark response on whether the 1928 unification was genuine).

The hollowness of the 1928 unification is exposed by the manner of the northern advance, which proceeded more by bargain than by battle. When the campaign resumed in 1928, Feng Yuxiang and Yan Xishan defected to the Nationalists in return for keeping their armies and provinces, and the fall of Beijing on 8 June 1928 - renamed Beiping - added territory without adding central authority. In Manchuria, Zhang Zuolin's assassination by the Japanese Kwantung Army (4 June 1928) was followed by his son Zhang Xueliang's declaration of allegiance to Nanjing on 29 December 1928, a submission that left the Northeastern Army intact under Zhang's command. The state Chiang nominally headed was thus a coalition of semi-autonomous militarists flying one flag, as the Central Plains War of 1930 - in which Feng, Yan and Wang Jingwei rebelled at the cost of perhaps 300,000 lives - would soon reveal. As Jonathan Fenby argues, the unity of 1928 was a structure of bargains rather than a unified state; Lloyd Eastman traces the Nanjing Government's later weakness directly to these founding compromises.

Marker's note: the paragraph argues a single proposition (unity in form, not substance), supports it with dated specifics, and uses two historians in genuine tension rather than as decoration. Sustained argument plus historiography is what lifts a paragraph into Band 6.

Command words and weaving historiography

Read the verb first. "Assess the significance" and "Account for" want factors WEIGHED and ranked, not a story; "To what extent / Evaluate" want a JUDGEMENT defending a thesis; "Assess the usefulness/reliability" of a source wants ORIGIN, MOTIVE and PERSPECTIVE, then a verdict. For source questions run O-M-P-U: Origin, Motive, Perspective, then Usefulness/limitation - and with this topic always ask whether a source is celebrating the KMT "unification" myth or the substance behind it. Weave historians as a clash, not a list: pit genuine state-building (Jay Taylor, Hans van de Ven - a real modern army and central institutions) against structural weakness (Jonathan Fenby, Lloyd Eastman - a patchwork of warlord bargains), then say which carries more weight and why. One historian used in genuine tension beats five name-dropped.

Exam-style practice questions

Practice questions written in the style of NESA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

Practice (NESA)10 marksAssess the significance of the Northern Expedition in the consolidation of Chiang Kai-shek's power by 1928.

Show worked answer →

A 10-mark "assess" needs a judgement, multiple developed factors, and a named historian.

Thesis: The Northern Expedition was decisive but partial. It made Chiang the nominal ruler of a unified China by 1928, but the unity rested on bargains with warlords, the violent purge of the Communists, and the strategic abandonment of social revolution.
Military success: Launched from Guangzhou on 9 July 1926 with around 100,000 National Revolutionary Army troops, the expedition took the Wuhan tri-cities (October 1926), Nanjing (March 1927), and Beijing (June 1928). Soviet advisers under Mikhail Borodin and General Vasily Blyukher supplied weapons, doctrine, and the Whampoa officer corps trained from 1924.
The United Front: The Communist Party of China (CCP) provided mass mobilisation. Peasant associations and union activists prepared the ground in Hunan and Hubei. Without them the rapid advance is unthinkable. Mao's "Report on an Investigation of the Peasant Movement in Hunan" (February 1927) captured the scale.
The purge and the bargain: Chiang turned on his allies in the Shanghai Massacre (12 April 1927) and broke with the Wuhan left-KMT government in July. The unity that followed was bought by accepting warlord defections (Feng Yuxiang, Yan Xishan, Zhang Xueliang) rather than defeating them.
The Nanjing Government: Capital was moved to Nanjing on 18 April 1927. Formal recognition by Britain (1928) and the United States followed. The new currency, the customs autonomy treaty (1928), and the Five Yuan Constitution (1928) gave the state form.
Historiography: Jay Taylor (The Generalissimo, 2009) treats the expedition as a real if compromised state-building achievement. Hans van de Ven (War and Nationalism in China, 2003) stresses that Chiang inherited an unfinished revolution. Jonathan Fenby (Generalissimo, 2003) is sharper on the violence and the warlord bargains. Markers reward dated battles, the Soviet role, and a clear judgement.

Practice (NESA)5 marksExplain the role of the Whampoa Military Academy in the rise of the Nationalist regime.

Show worked answer →

A 5-mark "explain" needs three developed points with evidence.

Origins: Founded 1 May 1924 on Whampoa Island near Guangzhou, with Soviet funding and advisers under Mikhail Borodin and Vasily Blyukher. Chiang Kai-shek was the first commandant; Zhou Enlai ran the political department.
Officer corps: The Academy produced the first modern, ideologically committed Chinese officer corps of around 5,000 cadets by 1926. Whampoa graduates dominated the National Revolutionary Army that launched the Northern Expedition in July 1926 and would form the core of Chiang's "Central Army" through the 1930s.
Political loyalty: Cadets swore personal loyalty to Chiang as well as to the KMT. This created the patronage network that allowed Chiang to outflank Wang Jingwei and the KMT left in 1927, to launch the Shanghai purge, and to dominate the Nanjing regime to 1937. The Academy is the institutional bridge between the United Front of 1924 and the dictatorship of the 1930s.

Markers reward the 1924 date, the Soviet role, the Northern Expedition link, and the connection to the 1927 purge.

Practice questions

Original practice questions graded from foundation to exam level, each with a full worked solution. Try them before revealing the solution.

foundation3 marksOutline three factors that allowed the National Revolutionary Army to advance so rapidly between July 1926 and March 1927.

Show worked solution →

A 3-mark "outline" wants three distinct, correctly dated factors, each in a sentence.

Soviet support and a trained officer corps: Whampoa graduates (around 5,000 by 1926) led an NRA armed and advised by the Soviets under Borodin and Blyukher.
CCP mass mobilisation: Peasant and labour unions organised by Communist cadres paralysed warlord rear areas in Hunan and Hubei; Mao's Hunan Report (February 1927) recorded associations of around two million members.
Warlord disunity and defection: The militarists (Wu Peifu, Sun Chuanfang) were uncoordinated, and some commanders defected rather than fought, letting the NRA outrun its supply lines.
Marking criteria: 1 mark each for three distinct factors with specific detail; do not simply narrate the campaign route.

foundation4 marksExplain how the Whampoa Military Academy contributed to Chiang Kai-shek's rise to dominance in the KMT.

Show worked solution →

A 4-mark "explain" needs a cause-and-effect chain with dated detail.

Origins (1924): Whampoa opened on 1 May 1924 near Guangzhou with Soviet funding and advisers; Chiang was its first commandant.
The officer corps: It produced around 5,000 ideologically committed officers by 1926 who dominated the NRA that launched the Expedition.
Personal loyalty: Cadets swore loyalty to Chiang personally as well as to the KMT, building the patronage network ("Whampoa clique") behind his command of the army.
The effect: Control of this loyal officer corps let Chiang outflank the KMT left under Wang Jingwei after Sun Yat-sen's death (1925) and dominate the Nanjing regime.
Marking criteria: 1 mark for the 1924 founding and Soviet role; 1 mark for the officer corps and NRA link; 1 mark for personal loyalty; 1 mark for connecting this to Chiang's dominance.

core5 marksSource A (paraphrased, owned): A Soviet adviser's 1926 report to Moscow records that the Nationalist army's rapid northern advance owed as much to peasant unions cutting warlord supply lines and to local commanders changing sides as to fighting, and warns that the "national revolution" rested on a fragile coalition. Using Source A and your own knowledge, explain why the Northern Expedition advanced so quickly. [5 marks]

Show worked solution →

A 5-mark "explain ... using the source" wants the source decoded, then linked to own knowledge.

Decode the source: As a Soviet adviser's internal report (origin), it has authority on the Soviet-backed campaign but also a motive to stress mass mobilisation and warn Moscow about coalition fragility. It identifies two engines of the advance - peasant union mobilisation and warlord defection - and flags the United Front's weakness.
Corroborate with own knowledge: Both fit the record: CCP-organised peasant and labour unions (Mao's Hunan Report, February 1927, recorded around two million members) paralysed warlord rear areas, while Feng Yuxiang and Yan Xishan later defected rather than fought. Soviet weapons and the Whampoa officer corps gave the NRA its cutting edge.
Outcome: This is why the NRA took Wuhan (October 1926) and Nanjing (March 1927) so fast - and why the "fragile coalition" shattered in the April 1927 purge.
Marking criteria: 1 mark for reading the source's origin/motive; 1-2 marks for own knowledge corroborating mobilisation and defection; 1 mark for the Soviet/Whampoa role; 1 mark for linking to the speed and the coming split.

core5 marksSource B (paraphrased, owned): A recent historian argues that the China "unified" in 1928 was a patchwork held together by bargains - warlords who kept their armies and provinces in return for flying the Nationalist flag - rather than a state with real central authority. Using Source B and your own knowledge, assess the usefulness of this interpretation for understanding the 1928 unification. [5 marks]

Show worked solution →

A 5-mark "assess the usefulness" rewards origin/perspective plus own knowledge, ending in a judgement.

Perspective: Source B is a revisionist historian's view stressing the limits of unification - useful because it corrects the KMT myth of a unified China and aligns with Jonathan Fenby (Generalissimo, 2003) and Lloyd Eastman (The Abortive Revolution, 1974).
Corroboration: It fits the record: Feng Yuxiang, Yan Xishan, and Zhang Xueliang submitted on their own terms (Zhang's Northeast Flag Replacement, 29 December 1928), keeping their armies; the Central Plains War (1930) and CCP base areas in Jiangxi soon showed how shallow central control was.
Limitation: By stressing the patchwork it can understate the real institution-building - the Five Yuan Constitution (October 1928), tariff autonomy (July 1928), the Central Bank (November 1928) and foreign recognition gave the Nanjing state genuine form.
Judgement: Highly useful for puncturing the "unified China" myth, but it must be read alongside the genuine state-building that began the Nanjing Decade.
Marking criteria: 1 mark for the revisionist perspective; 1-2 marks for own knowledge on warlord bargains; 1 mark for a limitation (real state-building); 1 mark for a judgement on usefulness.

exam25 marksEvaluate the extent to which the Northern Expedition (1926-1928) achieved a genuine unification of China.

Show worked solution →

This is an extended-response/essay. Markers reward a sustained, evidence-based argument that addresses "to what extent" directly and weaves in historiography - not a narrative.

Band-6 PLAN

Thesis. The Northern Expedition unified China in form but not in substance: by December 1928 Chiang was the nominal ruler of a state with a flag, a constitution and foreign recognition, but real authority extended only over the lower Yangtze, because unity was bought through warlord bargains and the abandonment of social revolution rather than won by conquest.
Argument 1 - The genuine achievement. Militarily the campaign broke the central warlords (Wu Peifu, Sun Chuanfang) and took Wuhan (October 1926), Nanjing (March 1927) and Beijing (8 June 1928). Institutionally the Nanjing Government (proclaimed 18 April 1927) gained the Five Yuan Constitution (October 1928), tariff autonomy (July 1928), a Central Bank (November 1928) and recognition from Britain and the United States. Evidence: Zhang Xueliang's submission (29 December 1928) made the map nominally one country.
Argument 2 - The hollowness of the unity. The northern "victory" was defection, not conquest: Feng Yuxiang and Yan Xishan joined Chiang and kept their armies and provinces; Zhang Xueliang held Manchuria. The CCP, purged in the Shanghai Massacre (12 April 1927), survived to build base areas in Jiangxi. Evidence: the Central Plains War (1930) saw the same warlords rebel, costing perhaps 300,000 lives.
Argument 3 - The cost of the method. Chiang's purge of the Communists and his bargains with the propertied classes meant the regime abandoned the peasant mobilisation that had powered the advance, leaving the agrarian crisis - tenancy, rural debt - unaddressed for the CCP to harvest.
Historiography. Jay Taylor (The Generalissimo, 2009) sees real, if compromised, state-building; Hans van de Ven (War and Nationalism in China, 2003) treats Chiang as an underrated moderniser inheriting an unfinished revolution; Jonathan Fenby (Generalissimo, 2003) and Lloyd Eastman (The Abortive Revolution, 1974) stress the warlord bargains and structural weakness the compromises bequeathed.
Judgement. Weigh genuine institution-building (Taylor, van de Ven) against the patchwork of bargains (Fenby, Eastman): the Expedition produced a real central state in the lower Yangtze but only a nominal unification of China - decisive in form, partial in substance.

MODEL PARAGRAPH (Argument 2)

The clearest sign that the 1928 unification was nominal lies in how the northern campaign actually ended. The second phase, resumed in April 1928, advanced less by battle than by bargain: Feng Yuxiang and Yan Xishan defected to the Nationalists and were rewarded with autonomy over their own armies and provinces, and when Beijing fell on 8 June 1928 it was renamed Beiping rather than garrisoned by a truly national army. In Manchuria, the assassination of Zhang Zuolin by the Japanese Kwantung Army (4 June 1928) was followed by his son Zhang Xueliang's declaration of allegiance to Nanjing on 29 December 1928 - a submission that added the Northeast to the map while leaving its Northeastern Army intact under Zhang's command. The state Chiang headed was therefore a coalition of semi-autonomous militarists flying a common flag, as the Central Plains War of 1930, in which Feng, Yan and Wang Jingwei rebelled at the cost of perhaps 300,000 lives, would soon expose. As Jonathan Fenby argues, the unity of 1928 was a structure of bargains; Lloyd Eastman sharpens the point, tracing the Nanjing Government's later paralysis to exactly these founding compromises.

Marker's note. A band-6 response keeps "to what extent" in view throughout - weighing genuine unification against its hollowness rather than narrating the campaign - anchors each claim in dated evidence, sets at least two historians in genuine tension (state-building vs structural weakness), and reaches a graded judgement. Narrating the Expedition without arguing how real the unity was caps the response in the middle bands.

exam25 marksTo what extent did the Northern Expedition's success depend on the First United Front rather than on Chiang Kai-shek's own leadership?

Show worked solution →

This is an extended-response/essay. Markers reward a sustained, evidence-based argument that addresses the comparison directly and weaves in historiography - not a narrative.

Band-6 PLAN

Thesis. The Expedition's rapid success depended heavily on the First United Front - Soviet aid and CCP mass mobilisation made the advance possible - but Chiang's leadership was decisive in converting that momentum into personal power, since he commanded the Whampoa army and chose the moment to discard his allies. The United Front supplied the means; Chiang supplied the direction and the ruthless end-game.
Argument 1 - The United Front as enabling factor. The 1924 alliance brought Soviet weapons and advisers (Borodin, Blyukher), the Whampoa Academy itself, and CCP-organised peasant and labour unions that paralysed warlord rears. Evidence: Mao's Hunan Report (February 1927) recorded around two million union members; without them the NRA could not have outrun its supply lines.
Argument 2 - Chiang's own leadership. Chiang built and commanded the loyal Whampoa officer corps, planned the three-column advance from Guangzhou (9 July 1926), and out-manoeuvred the KMT left under Wang Jingwei after Sun's death (1925). Evidence: it was his control of the army that let him relocate the capital to Nanjing and dominate the regime.
Argument 3 - The decisive moment: the purge. Chiang's choice to turn on the Communists in the Shanghai Massacre (12 April 1927) and bargain with the propertied classes shows leadership determining the outcome - he kept the military gains while jettisoning the social revolution his allies wanted. The unity that followed was Chiang's, not the Front's.
Historiography. Hans van de Ven (War and Nationalism in China, 2003) stresses the institutional army-building behind Chiang; Jonathan Fenby (Generalissimo, 2003) foregrounds his opportunism and the violence of the purge; Jay Taylor (The Generalissimo, 2009) reads the whole as compromised but real state-building under Chiang's direction.
Judgement. Weigh United Front means (Soviet aid, CCP mobilisation) against Chiang's agency (Whampoa command, the purge): the Front made the advance possible, but Chiang's leadership made it his - most of the speed was the Front's, most of the outcome was Chiang's.

MODEL PARAGRAPH (Argument 3)

The decisive role of Chiang's own leadership is clearest at the moment he broke the very alliance that had carried him north. By April 1927 the NRA had reached the Yangtze on the back of Soviet supplies and CCP-organised unions, yet the political settlement that followed was shaped not by the United Front but by Chiang's choice to destroy it. In the Shanghai Massacre of 12 April 1927 he turned his Whampoa-led forces and allied gangsters on the Communist labour organisers who had helped take the city, and within months the Nanjing Government he proclaimed (18 April 1927) had abandoned the peasant mobilisation that the alliance stood for. Chiang could make that choice because the army was personally his: the Whampoa officer corps owed him loyalty, giving him the leverage to discard both the CCP and the rival left-KMT government at Wuhan. As Jonathan Fenby argues, this opportunism, not Soviet doctrine, defined Chiang's rise; Hans van de Ven adds that the loyal modern army Chiang had built at Whampoa was the instrument that made his break with the Front survivable.

Marker's note. A band-6 response sustains the comparison throughout - always weighing the United Front's contribution against Chiang's own agency - anchors claims in dated evidence, uses two historians in genuine tension, and reaches a graded judgement rather than listing factors. Crediting either the Front or Chiang alone, or narrating the campaign, caps the response in the middle bands.