Usual stirling information from Phil aka Op Ack

Source: 405 S.B.A.C. ?

Due to the heavier weight of the ammunition used by Siege Batteries coupled with the fact that they operated more independently than Horse and Field Batteries, each had its own ammunition column. Commanded by an Army Service Corps Captain, composition varied during the war, however a typical organisation in September 1915 was: 2 Subalterns, 3 Serjeants, various Drivers (68 for 6"hows, 120 for 6"guns, 99 for 8"hows, 126 for 9.2"hows), 3 Batmen. In each case drivers include 2 for motor cars and 50% spare. A typical vehicle allocation at that time was, 32 3-tonners, 2 cars, 1 workshop lorry, 1 store lorry and 5 FWD lorries for gun work. The various Siege Battery Ammunition Columns were grouped into Siege Parks during 1916.