The ninth stage of the Kanigem Tournaments

People... I really don't understand how you play this game; I can't break through a single bridge!
Please, teach me how to play Heroes 4!

Ah, I really want to discuss this tournament and the bridges, but I'm afraid I'll not only get a reprimand here but also be kicked out of the tournament:D. In general, Fireball and "Iron Beast" can help you with Heroes 4 :D IronAxe
P.S. For me, playing Heroes 4 is much easier than Heroes 3, although I try to participate in tournaments (in Heroes 3), just for myself, for general development.:D