The Horse Artillery and Heavy Brigades of Artillery each had their own 'Brigade Ammunition Column (BAC)', organized in much the same way and performing similar duties. The Brigade Ammunition Column of the Heavy Brigade was divisible into three sections, so that the three batteries, if operating independently, have each a section at hand to replenish the ammunition expended. The Horse Artillery Brigade Ammunition Columns carried, besides S.A.A. for corps troops, other than artillery, the reserve of pom-pom ammunition. The Field Brigade Ammunition Column numbered 158 heads, commanded by a Captain, with three Lieutenants or Second-Lieutenants.