From the start of World War I, as they were 'newly' established, BEF/Dominion 'Infantry’ Divisions came to be assigned a 'Divisional Artillery' of three Field Artillery Brigades and one (Field) Howitzer Brigade, each Brigade having four batteries and a ‘Brigade Ammunition Column’. The British Army Divisional Artillery pre WW1 included an additional Heavy 60-pounder Battery. A Cavalry Division had two Horse Artillery Brigades each with 12 × 13-pdr Guns. As warfare progressed and the tank was introduced the demands of ammunition supply to armoured formations called for the development of like structures.