From page 314 of Fifty-to-One by Charles Ardai: In the midst of a gunfight aboard a ship, "[b]oth fell to the ground moaning."
To the deck? Sure. To the floor? Maybe? To the ground? No.
Interesting note: "Ground," in nautical terms, means "the bottom of a body of water." So, if these two fell to the "ground," they most likely were drowning. Moaning and drowning.