Tactics in BATTLES

those warriors that arrive (1-2 squads) will face your entire army, except for the units holding the door.

If not all seven slots in the army are occupied, the gate can be held by only one or two units, separated from the main stack (as long as they have enough health to reach the gate). The point is that a fallen unit of the attacker still continues to block the enemy's gate – it's like Alexander Matrosov... :) And the main stack can engage in a full-fledged melee battle.