World War II communists launched an offensive in Central China; in retaliation, Japan instituted harsh measures in occupied areas to reduce human and material resources for the communists. Continued antipathy between Chinese communist and nationalist forces culminated in armed clashes in January 1941, effectively ending their co-operation. In March, the Japanese 11th army attacked the headquarters of the Chinese 19th army but was repulsed during Battle of Shanggao. In September, Japan attempted to take the city of Changsha again and clashed with Chinese nationalist forces. German successes in Europe encouraged Japan to increase pressure on European governments in Southeast Asia. The Dutch government
Resistance during World War II first years of the war (1941–1942), but grew rapidly in the latter years, outnumbering the Polish and Soviet partisans by 2:1 or more (estimates give Yugoslavian forces about 800,000 in 1945, to Polish and Soviet forces of 400,000 in 1944). Some authors also call it the largest resistance movement in Nazi-occupied Europe, for example, Kathleen Malley-Morrison wrote: "The Yugoslav partisan guerrilla campaign, which developed into the largest resistance army in occupied Western and Central Europe...". The numbers of French resistance were smaller, around 10,000 in 1942, and swelling to 200,000 by 1944. Resistance during World War II Resistance movements during