When the guns started firing, Dracula turned into a swarm of bats, flying up to one of the guns before turning back to normal, and forcibly turned the still-firing gun to fire upon the other gun, effectively destroying it before he ripped off the gun and just tossed it off of the place it was mounted, before hopping down on the other side of the fence and just casually walking towards the doors to the Brotherhood's hideout. 

Alucard on the other hand, had turned into mist form to keep from being shot, then once the guns stopped firing he turned into Wolf Form and walked over, prying the gate open with his bare hands.