In July of 1945 at Potsdam, it was decided among the Big 3 (Winston Churchill, Harry Truman, and Josef Stalin) that Germany would be split along the Elbe River, with the Western powers getting control of the West, and the Soviet Union the East. The border between the two "countries" was lined with barbed-wire and communist-friendly guards. Berlin was also split in this way. It was also at this meeting that the Four-Power Agreement was signed, giving air access to West Berlin from West Germany; a highway route along with a canal into West Berlin were also allowed.