Tactics in BATTLES

If not all seven slots in the army are occupied, the gate can be held by just 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.

I completely agree! By the way, if it's the computer, it usually doesn't kill the unit at the gate and generally starts behaving very strangely. Sometimes it will break through the castle wall and stand with its army in front of the moat. A human also doesn't need to waste time on a unit holding the gate.

Added 1 minute ago
I misspoke; when I mentioned the strange behavior of the computer, I meant the situation when the computer is attacking a castle.