This is the story of a little-known Soviet-Japanese conflict that influenced the outbreak and shaped the course of the Second World War. In the summers of 1937, 1938, and 1939, Japan and the Soviet Union fought a series of border conflicts. The first was on the Amur River days before the outbreak of the 2nd Sino-Japanese War. In 1938, division-strength units fought a bloody 2-week battle at Changkufeng near the Korea-Manchuria-Soviet border. The Nomonhan conflict (May-September 1939) on the...