Key facts and dates

The Second United Front was a critical alliance between the Guomindang (GMD) and the Chinese Communist Party (CCP) formed in 1937 to resist Japanese invasion during the Second Sino-Japanese War. Despite internal conflicts, this alliance played a vital role in preventing a complete Japanese victory, though it was marked by distrust and eventual breakdown.

Timeline of key events:

• December 1936 – Xi'an Incident forces negotiations between GMD and CCP for cooperation.
• 1937 – Formation of the Second United Front following the outbreak of full-scale war with Japan.
• 1937-1938 – Periods of genuine cooperation in military efforts against Japanese forces.
• 1941 – New Fourth Army Incident escalates tensions with armed clashes between GMD and CCP.
• 1945 – End of the war with Japan; united front collapses as civil war preparations resume.

Background and formation of the Second United Front

In the mid-1930s, China faced internal division between the Guomindang (GMD), the nationalist government led by Chiang Kai-shek, and the Chinese Communist Party (CCP), led by Mao Zedong, who had been locked in a bitter civil conflict. However, the growing threat from Japan, coupled with a pivotal event, forced these rivals to temporarily set aside their differences.

Context leading to the alliance:

• Japanese aggression - By the early 1930s, Japan had already occupied Manchuria (1931) and was expanding its influence in northern China, posing a severe threat to national sovereignty.
• Internal conflict - The GMD prioritised eliminating the CCP over resisting Japan, pursuing military campaigns against communist bases, which weakened China's ability to respond to external threats.
• Xi'an Incident (December 1936) - Chiang Kai-shek was kidnapped by his own general, Zhang Xueliang, who demanded an end to the anti-communist campaigns and a united front against Japan. This forced Chiang to negotiate with the CCP, leading to a temporary truce.

Formation in 1937:

• Outbreak of war - Following the Marco Polo Bridge Incident in July 1937, full-scale war with Japan erupted, making national resistance a priority over internal strife.
• Alliance established - The Second United Front was formally agreed upon in 1937, marking the second time the GMD and CCP had allied (the first being in the 1920s), driven by the urgent need to counter Japanese invasion.

Terms of cooperation between the GMD and CCP

The alliance required significant concessions, particularly from the CCP, to create a unified resistance under GMD leadership. These terms aimed to integrate communist forces into the national war effort while maintaining a hierarchical structure.

Key agreements of the united front:

• CCP recognition of GMD authority - The CCP agreed to accept the GMD as the legitimate government of China, halting their revolutionary activities against Chiang's regime during the war.
• Redesignation of communist forces - The Red Army, the CCP's military wing, was reorganised into the Eighth Route Army, and later parts of it became the New Fourth Army, both nominally under GMD command.
• Commitment to joint resistance - Both parties pledged to focus their efforts on fighting Japan, coordinating military campaigns to defend Chinese territory.

Practical functioning and areas of collaboration

In the initial years of the war, the Second United Front demonstrated genuine cooperation, contributing to China's resilience against Japan. However, the alliance's effectiveness varied over time and geography.

Early cooperation (1937-1938):

• Joint military efforts - The GMD and CCP collaborated in several campaigns, particularly in northern and central China, combining their forces to resist Japanese advances.
• Shared goal of resistance - Both sides prioritised defending key cities and regions, with notable efforts during battles like the defence of Taiyuan in 1937, where coordinated actions delayed Japanese progress.
• Mutual benefit - The alliance allowed the GMD to maintain a centralised front while the CCP expanded its influence in rural areas under the guise of national defence.

Challenges in coordination:

• Limited integration - Despite formal agreements, the CCP armies often operated independently, focusing on areas where they could build local support rather than strictly following GMD directives.
• Geographical division - The GMD controlled urban and southern regions, while the CCP dominated rural and northern territories, leading to separate spheres of influence even during cooperation.

Strategic differences and growing tensions

As the war progressed, fundamental differences in military strategy and political goals strained the alliance. Mutual distrust and competition for power undermined the united front, culminating in open conflict.

Contrasting military approaches:

• GMD conventional warfare - The GMD relied on large-scale, conventional battles, focusing on defending cities and key infrastructure with a formal army structure, often suffering heavy losses against superior Japanese forces.
• CCP guerrilla tactics - The CCP employed mobile, guerrilla warfare, targeting Japanese supply lines and occupying forces in rural areas, which proved more effective in sustaining long-term resistance and gaining peasant support.

Rising conflicts and mutual suspicions:

• Competition for territory - Both sides sought to expand their influence during the war, with the CCP establishing base areas in the countryside, which the GMD viewed as a threat to their post-war authority.
• Occasional armed clashes - Tensions boiled over into direct confrontations, most notably the New Fourth Army Incident in 1941, where GMD forces attacked CCP units, resulting in thousands of casualties and a severe breakdown in trust.
• Preparations for civil war - Even during the alliance, both parties stockpiled resources, recruited followers, and planned for an inevitable resumption of their internal struggle once the Japanese threat was removed.

Political consequences and impact on the war against Japan

Despite its flaws, the Second United Front had a significant impact on the course of the war and the political landscape of China. It shaped the power dynamics that would define the post-war era.

Impact on the war effort:

• Prevention of Japanese victory - The united front ensured that China maintained resistance on multiple fronts, with the GMD engaging in major battles and the CCP disrupting Japanese control through guerrilla campaigns. This dual pressure stretched Japanese resources thin.
• Prolonged resistance - By avoiding total collapse, the alliance kept China in the war until Allied support, particularly after the United States entered in 1941, shifted the balance against Japan.

Long-term political effects:

• CCP expansion - The war allowed the CCP to grow significantly, increasing their membership and control over rural populations through effective guerrilla campaigns and social reforms, positioning them as a major force by 1945.
• Weakening of GMD authority - The GMD suffered from military losses, corruption, and internal dissent, compounded by their focus on conventional warfare, which eroded public support and left them vulnerable to the CCP's post-war challenge.
• Foundation for civil war - The tensions and rivalries nurtured during the united front set the stage for the renewed Chinese Civil War (1946-1949), as both sides emerged from the conflict with irreconcilable aims and strengthened military capabilities.

Through these dynamics, the Second United Front, though fraught with challenges, played a pivotal role in China's resistance to Japan and the reshaping of its political future.