a train on the Union Pacific. A party of officers had them safe at Green River a couple of days ago, but they broke loose in some way and came north."
"It's a wonder they headed straight for our campfire!" Will suggested.
"That's what puzzles me!" the other said. "Until I saw you were only boys, probably out on a vacation, I thought the robbers might be associates of yours."
"I hope they won't think so, too," Will answered. "We expect to stay here two or three weeks, and we don't want to get into any mixup."
"They probably won't trouble you any," the officer remarked, "as they're undoubtedly headed for the Bad Lands in Big Horn county. If they get into that country we may as well give up the search."
"Well," Will suggested, "they won't have any horses to ride before morning, and you may be able to overtake them after they slow down."
"Oh, we're going to keep on in pursuit!" cried the officer, "But we have little hope of overtaking them. They're probably five miles in