While Roosevelt operated from Gander in August 1941, FDR detached him and brother Franklin Jr. to attend the Argentia (Atlantic Charter) summit between Churchill and FDR, which was nearby. In January 1943, Roosevelt accompanied FDR as a military attaché to the Casablanca meeting and the subsequent Cairo and Tehran Conferences in November–December 1943. At a dinner during the Tehran Conference, Joseph Stalin proposed to round up and shoot some 50,000 German officers and technicians after the war in order to permanently incapacitate Germany. Roosevelt spoke in favor of the proposal which earned him Stalin's cheers and the vocal and lasting hostility of Churchill who said "I would rather be taken out into the garden here and now and be shot myself".