In 1916 he was promoted to Principal Clerk and in 1917 was appointed Director of the Overseas Division of the Foreign Office Department of Overseas Trade, a post he held until 1933, when he was promoted to Assistant Under-Secretary of State for Foreign Affairs.
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Later that year, at the conclusion of the war, Davis served on the British delegation to the Paris Peace Conference between December 1918 and March 1919, and then spent a few weeks as the acting director of the Department of Overseas Trade at the invitation of Sir Arthur Steel-Maitland and in the New Years Honours of that year, Davis was made Commander of the British Empire.