Forum:Cry Havoc!

I wonder what does Cry Havoc! do? Because summoning using this card's effect is treated as a normal summon. On the other hand, we can only normal summon or set once per turn.

The OCG ruling also says: "You cannot "Normal" summoned a monster that needs sacrifice, NOR you can sacrifice a monster and get extra summon by this card's effect." Does this 'sacrifice' means tribute?

Actually, I'm trying to create a deck which use high leveled normal monsters to be summoned instantly in one turn.