Cal Evans could not know what was passing in the mind of the swarthy cowboy. His own brain and every nerve of his body seemed to be all a tingle of excitement. He was now able to think about it and to be proud that he felt no fear. That is, no fear concerning anything but the horses.

On, on, on, went that tumultuous race, and the line of forest was very near now. It was a sort of natural barrier, stretching across the plain as if put there to check the sweep of "norther" storms and prairie fires, and any sort of stampedes. The middle of it was a winding ravine or slough, and at some seasons it was a river, instead of a string of ponds for buffalo wallows. All the wild or tame quadrupeds on that plain knew the value of Slater's Branch, and some of them, and all of the men, knew that it never quite went dry, and that its faculty to become a river could be exercised at any time on short notice, when the snow in the mountains melted rapidly or when a cloud-burst came on this side of the Sierra.

The trees and bushes knew all about Slater's Branch, and they came and settled for life on its banks, making a timber-belt thick and tall, with here and there dense undergrowths for the deer to lie in.

Cal Evans could not quite understand the present value of that line of forest, and yet he felt that it had a sort of sheltering look, and he was particularly glad to be galloping nearer and nearer, for there was an unpleasant chorus of whoops and yells only about a quarter of a mile behind him, and it was manifestly growing louder.

"Cal," growled Sam Herrick, "they've gobbled hosses enough for this trip. They can't have any more out of your father's corral. The critters are getting into cover. Keep cool, Cal. We may have to throw lead, some; but I reckon not much."

"Won't they follow us into the woods, then?" asked Cal, doubtfully.

"That's the question," replied Sam. "If they're young bucks they may; but not if there's a chief or an old brave among 'em. I'll show you."

Cal was conscious of understanding the feelings of young braves who needed an old chief to hold them back. He knew that it would be almost a disappointment if he and Sam should succeed in saving the horses without any shooting. He had no desire to hurt anybody or to be hurt, but then the idea of a skirmish and a victory and all that sort of glory made him think of all the Indian battles he had ever read about.

Sam Herrick was armed to the teeth, as became a cowboy in that region, and yet it had been a long time since any hostile savages had troubled it. The herds and droves had multiplied, year after year, almost unmolested, for the Apache bands were either driven over the Mexican border, or into Arizona, or were gathered on their reservations. If Cal had been asked, that morning, why he carried his own weapons, his best excuse would have been "I thought I might hunt a little," and his real reason would not have been told unless he had said: "I love a gun, and I'd rather carry one than not, and a fellow can keep thinking what he'd do with it if he had a chance."

He had not tried to do any hunting, but his chance to do something else had come, or it looked like it, very suddenly.