It is very difficult to hold the castle as well as to conquer it. Useful tips for defending the castle will help you on how to hold the castle after conquering in Mount & Blade II: Bannerlord.
How to Defend the Castle?
Destroy the armies to wander around after the conquest.

As soon as you see the warning “Your settlement is under attack”, return to your castle and defend it, otherwise, you may lose the castle.
Useful Tips for Defending the Castle
During the castle defense, put all the archers on the castle walls. Especially put the archers on the edge of the castle to kill the enemies coming to the door more easily, since shooting to enemies hiding behind the barricades does not work. For example, see the image:

If you have artillery units on the castle walls, you will have a great advantage.
Try to find Commander and kill him. This way, you can damage enemy armies more easily.
Follow hordes of enemies who come to knock your door. On the other hand, try to attack the soldiers carrying the log. In this way, they cannot break the door and have to climb the fortress walls by stairs.

Also, put the troop, which you believe is the most beautiful, in front of the door because the first attack causes great damage. If you survive the first attack with light wounds, your job will be easier.
Enemies fleeing follow while in the battle and kill them. This is the simplest and easiest way to do damage. In this way, you can minimize the powers of enemy armies in an easy way.
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