I found an exploit that allows you to easily take a castle

[nettek]

Here are the details:

1. I own my own kingdom.
2. I attacked the castle of Rosby with some lords.
3. I built mantles and then siege equipment that allows you to attack.
4. I waited until the defenders attacked me.
5. After winning, I gave the order to place the siege equipment and attack.
6. I saw that I lost no one and the enemy lost some men.
7. In the attack, only one enemy soldier was there. Of course that's not possible since the castle had about 950 defenders.
8. After killing him, the castle was taken.