The Allied effort in World War II was designed by three men: Winston Churchill, Franklin Delano Roosevelt and Joseph Stalin. Within hours of the Nazi invasion of the Soviet Union, Roosevelt and Churchill announced the support of their nations for the Soviets' fight against Germany. They pledged whatever was needed to defeat Hitler. The Big Three met twice: at Tehran in 1943 and Yalta in 1945. While Soviet, British and American soldiers fought together against the common enemy, the leaders of their nations worked together to end the war and secure the peace for future generations. The outcome of the Allies' joint efforts was the meeting of Soviet and U.S. forces on the Elbe River in Germany.