Is anyone able to interpret the 'hit' categories reported in anti-aircraft actions? I can't seem to find an explanation on the web. Here's the entry I'm trying to work out (from HQRA 14th Indian Division's diary): Chittagong 25th October 1942 CHITTAGONG aerodrome attacked by 24 "0" Zero JAPANESE Navy Fighters. No bombs dropped. One Blenheim aircraft on ground totally destroyed by JAPANESE cannon and machine gun fire. JAPANESE planes engaged by six guns of 75 Lt A.A. Bty. Three hits category 3 claimed. Amn expended 104/40mm, 28 SAA. What is a 'category 3' hit, and how many categories were there? Also, while the 40mm ammo expenditure must be from their Bofors guns, what about the SAA? Is this the counting of every pot-shot from a rifle taken by members of the unit? Or perhaps a Lewis or Bren gun mounted on a vehicle - would that be considered Small Arms Ammunition in this context?