As in the Winter War, Swedish volunteers were recruited. Until December 1941, they were tasked with guarding the Soviet naval base at Hanko. When it was evacuated by sea in December 1941, the Swedish unit was officially disbanded. During the Continuation War, the volunteers signed up for three to six months of service. In all, over 1,600 Swedish volunteers fought for Finland, although only about 60 remained by the summer of 1944. About a third of the volunteers had previously participated in the Winter War. Another significant group—about a quarter of the men—were Swedish officers on leave.