What areas were fought over in the war fought by the Japanese Fourth Army?
Fourth Army (Japan) The Japanese 4th Army (第4軍 , Dai-yon gun ) was an army of the Imperial Japanese Army based in Manchukuo from the Russo-Japanese War until the end of World War II.
Thirty-Seventh Army (Japan) The Japanese 37th Army (第37軍 , Dai-sanjyūnana gun ) was an army of the Imperial Japanese Army during World War II.