sentences:  He held many key diplomatic posts, including charge in Beijing after the Revolution, ambassador to Egypt at the time of Suez, a development with which he was clearly uncomfortable, ambassador to Iraq at the time of the 1961 Kuwait crisis, Iraq's first attempt to annex Kuwait, and ambassador to the Soviet Union.He completed forty years of public service as the last high commissioner of Aden, where he wound up British protection and oversaw the British withdrawal from what had been the Aden Protectorate and became South Yemen.Trevelyan wrote a number of books about his career, including "The India We Left" and "The Middle East in Revolution".