The T-26 together with the BT was the main tank of the Red Army in the 1930s. Even though it was no longer good enough to be used in battles at the beginning of World War II, the T-26 was the most important tank of the Spanish Civil War. It was also used during the Battle of Lake Khasan in 1938 and in the Winter War in 1939–40. The Red Army mostly had T-26s during the German invasion of the Soviet Union in June 1941. The T-26 was used against the Germans in the Battle of Moscow in winter 1941/1942, the Battle of Stalingrad and the Battle of the Caucasus in 1942–1943. Some tank units of the Leningrad Front used their T-26s until 1944. The Soviet T-26 light tanks were last used in August 1945, during the defeat of the Japanese in Manchuria.