How did the Chinese Nationalist Party and the Chinese Communist Party cooperate during the Second Sino-Japanese War?

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During the Second Sino-Japanese War, the Chinese Nationalist Party (KMT) and the Chinese Communist Party (CCP) formed the second United Front in 1937. This alliance was established on the basis of cooperation against the Japanese invasion, following the Xi'an Incident where Chiang Kai-shek was compelled to agree to unite against Japan.

Under this agreement, the CCP reorganized its army, the Eighth Route Army, nominally under KMT direction. While the regular KMT armies often retreated or were defeated, the communist guerrillas actively fought behind Japanese lines, mobilizing the population and expanding their influence. Despite official cooperation, tensions and clashes between the KMT and CCP persisted throughout the war, each vying for ultimate advantage. The United Front officially dissolved in 1945, leading to a full-scale civil war.123