Answer: D. Crook's unit of 1300 men was attacked and retreated.
Explanation: General Crook was part of the mission sent out with Custer to force the Indians onto the Reservation. His unit was attacked and subsequently retreated. He had the largest unit with 1300 men which could have made the difference at Little Big Horn.
Riddles were originally a form of oral literature, rather than written down, so think of how the riddle sounds when you say it. Try not to bog down your riddle with elaborate words or abstract concepts.