The Finnish reconquest of the Karelian Isthmus (1941) refers to a military campaign carried out by Finland in 1941. It was part of what is commonly referred to as the Continuation War. Early in the war Finnish forces liberated the Karelian Isthmus. It had been ceded to the Soviet Union on March 13, 1940, in the Moscow Peace Treaty, which marked the end of the Winter War. Later, in the summer of 1944, the Soviet Union reconquered the southern part of the isthmus in the Vyborg-Petrozavodsk Offensive.