There were broad marks of automobile tires in the dust. Cameron had been watching them. Although he said nothing about it to the cowboy, yet he turned from the road at a point where another car had made the turn.
Straight for the hills the lieutenant headed, and as they came closer, McGlory suddenly dropped a hand on Cameron's arm.
"Do you hear it?" asked the cowboy excitedly.
"Hear what?"
"Firing. There it goes again."
Cameron heard it, but it was very faint.
"That sounds as though we were going to get next to something," said McGlory.
"And looks like it, too. Isn't that a horse I see against the background of a hill, over there?"
The cowboy looked straight ahead.
"You're right!" he cried. "There's a horse there, and a man farther along. The man's shooting at the face of the uplift. There! Hear that, Cameron? What's he wasting ammunition like that for?"