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.
Aoba Detachment (Imperial Japanese Army) Aoba Detachment was the reinforced 4th Infantry Regiment/IJA 2nd Division, a part of the Seventeenth Army. The commander of the Aoba Detachment was Major General Yumio Nasu, the commander of the 2nd Division's Infantry Group. Unlike other detachments which were usually named after their commander, the Aoba Detachment is thought to have been named after Mt. Aoba in Sendai, hometown of the 4th Infantry Regiment.