Winston Churchill was in negotiations with the Americans in July 1942, at a time when the British had no military successes. The Americans had been keen for a cross-channel invasion in 1942, but Churchill was able to dissuade them and to put in place plans more compatible with what he wanted to see happen. He was successful in getting the Americans to agree to a North African invasion and to postpone the cross-Channel invasion until the Allies were better prepared. The North African invasion was named "Torch" and was planned for 30 October 1942.
After these discussions, Churchill turned his attention to the Middle East. He had the sense that a change of leadership was needed in North Africa and the Mediterranean Theater. The British ought to have beaten Rommel in North African, and the generally held opinion was that with a better general, they would have. While Churchill was thinking of visiting the Middle East, he received an invitation from Stalin to visit Moscow. In the event, he made the trip on an American B-24 Liberator, an aircraft with the necessary range. This is based on the account in Vol.III of the Official History.