when did the war against japan start
The Second Sino-Japanese War (July 7, 1937 â September 9, 1945), so named due to the First Sino-Japanese War of 1894â95, was a military conflict fought primarily between the Republic of China and the Empire of Japan from 1937 to 1945.he Japanese were also unable to defeat the Chinese communist forces in Shaanxi, which continued to perform sabotage operations against the Japanese using guerrilla warfare tactics. On December 7, 1941, the Japanese attacked Pearl Harbor, and the following day (December 8, 1941) the United States declared war on Japan.