"Ashes' Will" - "Awakening of the Bull" [Campaign 2, Mission 3]

I have a problem in this mission: I can't attack the blue hero's Castle. I approach it, press attack, and it just stands in front of it, and the battle doesn't start. :confused: What should I do? When I approach the catapults and shoot, a huge meteor falls on me:eek: and the game freezes.