So raise your draw bridge and drown them in the moat
Hov is painting a mental picture here. When he says “So raise your draw bridge and drown them in the moat” He is talking metaphorically about raising your arm with your gun in it and killing the enemy (The Draw bridge), leaving them in a river of their own blood (The Moat).
Another reference to kings; Some medieval castles uesd to be surrounded by water, this is called a “moat”. The only thing that connects the castle to dry land is a draw bridge like this:
To protect the king and the castle; people would ofter raise the drawbridge and let the attackers fall in the moat to drown.
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