During the German occupation no organised football took place, as a result of all athletes going on strike in support of the resistance. After the war football was more popular than ever, and Fredrikstad set another attendance record against Sarpsborg in the semifinal of the 1945 Norwegian Cup. There was, however, little success on the pitch. FFK reached three cup finals in four years, but lost all of them. The break came in 1949, when FFK won their third league title.