At noon on August 19, 1943, Winston Churchill met with the British Chiefs of Staff and had a great “row” over the planning of operations in South East Asia. General Alan Brooke, the Chief of the Imperial General Staff, recorded in his diary that it was a “poisonous day,” as Churchill argued for military operations in Sumatra. The discussion with the prime minister and his chiefs of staff “settled nothing.” At 1:30 p.m. Churchill had luncheon with Franklin Roosevelt and other officials on the terrace of the Citadel, which was followed by discussions with the American president. At 5:30 p.m. Churchill and Roosevelt met in a plenary session with the Combined Chiefs of Staff held at the Citadel. Overlord, Far Eastern Strategy, and the Italian front were discussed with the prime minister and president giving their agreement to the report of the Combined Chiefs. In the session, which adjourned at 7:45 p.m., Churchill supported the launching of the cross-channel invasion in 1944, but returned to an invasion of Sumatra, which he said would be “a great strategic blow.” At 9:30 p.m. Churchill and his family had dinner with Roosevelt and presidential adviser Harry Hopkins. After dinner Churchill and Roosevelt talked for “several hours.” At the conference that day Churchill and Roosevelt signed the articles of agreement on Anglo-American atomic cooperation.