After working as secretary-general of the administrative district of the Rhone Delta (including Marseilles), he was appointed resident minister of Tunisia which he organized into a French protectorate. Transferred to Turkey, he failed to negotiate a British withdrawal from Egypt and, in 1898, was made Ambassador to Great Britain. His efforts there led to the signing of the Entente Cordiale, strengthening France's position in the Moroccan conflict and preparing the way for the Franco-British alliance of World War I. During the war, Cambon played an important role in relations between France and Great Britain. At the Versailles Conference, he served on the Turkish commission. After retired from his ambassadorship, he was named to the French Academy of Moral and Political Sciences.