The 1st Canadian Infantry Division was included in Operation Husky at the insistence of the Canadian Prime Minister, William Mackenzie King, and the Canadian Military Headquarters in the United Kingdom. This request was granted by the British, displacing the veteran British 3rd Infantry Division. The change was not finalized until 27 April 1943, when Lieutenant-General Andrew McNaughton, then commanding the Canadian First Army in the United Kingdom, deemed Operation Husky to be a viable military undertaking and agreed to the detachment of both the 1st Canadian Infantry Division and the 1st Canadian Tank Brigade. The "Red Patch Division" was added to Leese's XXX Corps to become part of the British Eighth Army.