The Divisional Ammunition Column collected ammunition from the Army Service Corps Divisional Ammunition Park, as the higher movement and supply of ammunition was coordinated at Corps level. A second scale of ammunition was stored in the Divisional Ammunition Park whilst a third scale was stored in the Corps Ammunition Park, which received and held replenishment from the Corps Ordnance Depot. Mechanical transport companies of the Army Service Corps carried out ammunition supply for RGA Heavy and Siege Batteries, given one company was included within each Army and Corps. The Brigade Ammunition Columns and Divisional Ammunition Columns thus carried ordinarily seven or eight kinds at least of field, horse, howitzer and heavy gun shrapnel, howitzer and heavy gun lyddite shells, cartridges for the four different guns employed and pom-pom cartridges for the cavalry, in all twelve distinct types and varied small arms and machine gun ammunition. Consequently, the rounds of each kind in charge of each ammunition column must vary in accordance with the work expected of the combatant unit to which it belongs. Thus, pom-pom ammunition is out of place in the Brigade Ammunition Columns of field artillery, and S.A.A. is relatively unnecessary in that attached to a Heavy Artillery Brigade. Under these circumstances, a column may be unable to meet the unique wants of troops engaged in the vicinity; for instance, a cavalry regiment would send in vain to a heavy artillery ammunition column for pom-pom cartridges. The point to be observed in this is that the fewer the natures of weapons used, the more certain is the ammunition supply. On 13 May 1916, originating from BEF GHQ, orders were issued for the reorganization of Royal and Dominion/Indian Divisional Artillery establishments, they were to be restructured having four ‘mixed’ Artillery Brigades, to a standardized / universal establishment, each being allocated three Field Artillery Batteries and one Howitzer Battery. This ‘operational decision’ additionally saw the abolition of the four integral ‘Brigade Ammunition Columns’ and they being broken up or absorbed into their supporting ‘Divisional Ammunition Column’. Having to absorb three Field BACs and a Howitzer BAC, the DAC would take on additional authorized ammunition wagons, horses and personnel, and excess to establishment personnel would be moved as artilleryman to any of the sixteen gun/howitzer batteries, of the Division. This ‘internal’ reassignment of BAC gunner officers and artilleryman was consistent with past practices, as since 1906, it was an established routine to consider ‘ammunition column’ personnel, as a manning reserve and a source of timely replacements for ‘casualties’ in their brigade's batteries.