What areas were fought over in the war fought by the Japanese Fourth Army?
Russo-Japanese War The Russo–Japanese War (Russian: Русско-японская война , "Russko-yaponskaya voina"; Japanese: 日露戦争 "Nichirosensō"; 1904–05) was fought between the Russian Empire and the Empire of Japan over rival imperial ambitions in Manchuria and Korea. The major theatres of operations were the Liaodong Peninsula and Mukden in Southern Manchuria and the seas around Korea, Japan and the Yellow Sea.
Invasion of South Sakhalin The Invasion of South Sakhalin also called the Battle of Sakhalin (Russian: Южно-Сахалинская операция) and (Japanese: 樺太の戦い) was the Soviet invasion of the Japanese territorial portion of Sakhalin island known as Karafuto Prefecture. The invasion was part of the Soviet–Japanese War (1945).