Swedish intelligence reports that the Red Army would violate the Yalta agreement and advance from Germany to Denmark were what had prompted Operation Eclipse . Capture of Denmark would have given the Soviet Union a postwar port free of the ice that blocked its own port of Murmansk several months each year . By establishing Allied control of Kiel and of the German scientific bases between that city and the Danish border , Hibbert 's force forestalled such a Russian move
Yalta agreement
Yalta Conference
Tony Hibbert (British Army officer)