Crumble

[Lord_Bob]

The problem is that while Crumble WILL completely destroy the wall, the defenders may still repair it before you can attack.

I believe that when you are actually sieging a castle the order is this:

1-Crumble destroys Wall
2-Defenders Repair Wall
3-Siegers Damage Wall
4-If Wall is still at 0, then Siegers attack

Now, the question is, do the defenders still repair if the siege has just begun. I think so. Since none of your army is set to "Siege Castle" then you are not going to be able to remove whatever small repairs they do that turn.

I'm pretty sure you need an attacking army that can do more siege damage than the defending army can repair. Siege Damage is the square of unit strength divided by, I think, 100.