After the secularization of the Teutonic Knights in 1525 , Mühlhausen became a part of the Duchy of Prussia , and the Kingdom of Prussia in 1701 . In 1643 , Mühlhausen came into the property of the von Kalckstein family until 1826 , also as advowson of the Church . Conquered by the Red Army during World War II , Mühlhausen was transferred from Germany to the Soviet Union according to the 1945 Potsdam Conference and had its German population expelled . It was given its present name by the Soviets
Potsdam Conference
Potsdam Conference
Gvardeyskoye, Kaliningrad Oblast