What was the result of the attack of the pirates on the stockade

Of the men in the stockade, two were injured and one shot in the head.

As to the pirates:

"Five!" cried the captain. "Come, that's better. Five against three leaves us four to nine. That's better odds than we had at starting. We were seven to nineteen then, or thought we were, and that's as bad to bear."*
*The mutineers were soon only eight in number, for the man shot by Mr. Trelawney on board the schooner died that same evening of his wound. But this was, of course, not known till after by the faithful party.