In my recent game, my opponent (US) attacked Mannasass in June 61 in 4 seperate columns, resulting in 4 separate battles. Next turn, I advanced with the main CSA army on Alexandria , where I had 5 separate battles with brigade sized reinforcements pouring in one by one.
This has created an unusual situations where whole ammo was spent on minor battles.
This brings up an potential exploit issue. One could organise 10 separate militas to attack well fortified place on 10 different days, in a hope defender will spend all their ammo, and plan a main invasion force on the last day of the turn. Personally, I would never do that.
My question is does a whole army needs to spend its ammo if it is attacked by a single regiment?
What are your opinions on the subject?