If you're defending a fort, just place your troops guarding the stairs down from the walls and in an arc around the flag, firing onto the flag. If the wall is breached, form up around the breach. Sacrifice freebie defenders to man the cannons on the walls, or fighting on the ground if needed. When their infantry reaches the flag they'll be exhausted and will break easily. The only minor threat is cavalry. You can tie them up with flintlocks and fire with better troops into the melee or have a single unit of square capable infantry deal with them.
It's cheesy, but it works frighteningly well. There's no reason whatever to lose even a single unit defending a fort, regardless of opposition, given that it is under AI control.
In the field, well... cannister and rank fire has never failed me. Envelop and destroy.
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