Field Marshal Sir Henry Hughes Wilson, 1st Baronet, GCB, DSO, (5 May 1864 – 22 June 1922) was a British Army officer and Irish Unionist politician. He was one of the most senior British Army staff officers of World War I and played an important role in Anglo-French military relations both before and during the war. His only experience of field command was as a corps commander in 1916. Later in the war he was military advisor to the British prime minister, serving as Chief of the Imperial General Staff (professional head of the Army) in the last year of the war. Wilson had been involved in the Curragh Incident in 1914 and after the formation of Northern Ireland, he became security advisor to the Northern Ireland government.