The document summarizes key events of the Second Sino-Japanese War from 1931 to 1945. It describes how the Japanese invaded Manchuria in 1931 and continued pushing into China over subsequent years, with major battles including the Marco Polo Bridge Incident, the Battle of Shanghai, and the Rape of Nanking. While inflicting heavy casualties on the Chinese, the Japanese also suffered increasing losses as the war progressed. By 1941 the Chinese army had been largely destroyed, leaving China occupied until the end of World War II in 1945.