Boarding in the Age of Sail was more difficult and dangerous than in previous eras of open-decked sailing vessels. Defenders could seek cover in "closed quarters" in the ship's roundhouse or foredeck, shooting through small loopholes at the exposed boarders. The defenders could also place grenades on their gunwales or dangle them from their yards, detonating them by fuses of quick match that led back through the loopholes into the closed quarters. If not in closed quarters, defenders sometimes resorted to the naval boarding pike, trying to kill or wound boarders while keeping them at a distance, and of course might use any of the weapons that the boarders themselves used.