 Complete the following phrase:  A few days later Tito arrived and Maclean had to convey Churchills displeasure at his sudden and unexplained departure. Tito had been to Moscow at Stalins invitation, to arrange matters with the Soviet High Command. Maclean helped to hammer out a draft agreement, and went to London with it, while Titos envoys took it to Moscow. It was a difficult and thankless task. King Peter, quite naturally, was not easy to reassure, and Tito, sitting in Belgrade with all the cards in his hand, was not easy to satisfy. The bargaining went on for months, and meanwhile Macleans staff wanted to get away, to assist guerrilla wars elsewhere. When the Big Three Churchill, Roosevelt, and Stalin 