date two months later. Training and reorganization commenced upon arrival in the United Kingdom in October 1914, and it was not until 26 January 1915 that the division was officially organized, under the command of Lieutenant-General Edwin Alderson, a British Army officer. Several units under command of the First Contingent were excluded from the divisional organization, including the 17th Battalion (Nova Scotia Highlanders), 18th Battalion, and several companies of Newfoundland soldiers (later formed into the Newfoundland Regiment and assigned to the 29th Division). The division consisted originally of a cavalry squadron, cyclist company, four infantry brigades, three artillery brigades (equivalent in terms of numbers to the regiments used in the Second World War and after) armed with 18-pounders, and divisional engineers, with supporting troops of the Canadian Army Service Corps and Canadian Army Medical Corps. The strength of the division was placed at 17,873 all ranks, with 4,943 horses. The 4th Brigade was broken up in January 1915, with one battalion (the 10th) going to the 2nd Brigade, and the other three battalions being used to form the Canadian Training Depot, ultimately being re-designated as "Reserve" Battalions. The 10th Battalion replaced the 6th Battalion (Fort Garrys), which left the 2nd Brigade to become a cavalry unit, later serving in the Canadian Cavalry Brigade. Pioneer units were added later in the war, including the 1st Canadian Pioneer Battalion from Mar 1916 to Feb 1917, when they became the 9th Canadian Railway Battalion. The 107th Canadian Pioneer Battalion also came under command between Mar 1917 and May 1918, before being absorbed by the 1st Canadian Engineer Brigade. Lieutenant-General Alderson was selected and appointed in October 1914 to command the new Canadian Division, as it was known at that time, making him the highest ranking divisional commander in the British Army. He was selected — to the relief of many — in lieu of Sir Sam Hughes, who was promoted at this time by the prime minister to the rank of Major-General. It had been Hughes's wish to command the Canadians in action. Alderson, who had commanded Canadian units before, won out over three prospective Canadian appointees, who, while serving with the British Army, were still considered too inexperienced. Alderson, meanwhile, had first seen action against the Boers in 1881, and thereafter fought in Egypt, the Sudan (he served with a Camel Corps in the Nile Expedition of 1884-1885) and Mashonaland. He also