The Canadian Corps was created with the arrival in France of the 2nd Canadian Division. Lieutenant-General Alderson, a senior British officer and commander of the 1st Division, was appointed commander of the Canadian Corps on 13 September 1915. Canadian Arthur Currie replaced Alderson as commander of the 1st Division. The 2nd Canadian Division entered the front line on 22 September and was deployed alongside the 1st Canadian Division opposite Messines Ridge in the Ypres sector of western Belgium. The creation of the Canadian Corps meant that all Canadian troops on the Western Front would serve under one command.