It was the last great effort for the stallion. Before them rose the foothills of the Roydon mountains; behind them the Las Casas range was lost in mist. It seemed that they had been galloping like this for an infinity of time, and Andrew was numb from the shoulders down. If he reached those hills Gray Peter was beaten. He knew it; Hal Dozier knew it; and the two great horses gave all their strength to the last duel of the race.

The ears of Sally no longer pricked. They lay flat on her neck. The amazing lift was gone from her gait, and she pounded heavily with the forelegs. And still she struggled on. He looked back, and Gray Peter still gained, an inch at a time, and his stride did not seem to have abated. The one bitter question now was whether Sally would not collapse under the effort. With every lurch of her feet, Andrew expected to feel her crumble beneath him. And yet she went on. She was all heart, all nerve, and running on it. Behind her came Gray Peter, and he also ran with his head stretched out.

He was within rifle range now. Why did not Dozier fire? Perhaps he had set his heart on actually running Sally down, not dropping his prey with a distant shot.

And still they flew across the flat. The hills were close now, and sometimes, when the drizzling rain lifted, it seemed that the Roydon mountains were exactly above them, leaning out over him like a shadow. He called on Sally again and again. He touched her for the first time in her life with spurs, and she found something in the depths of her heart and her courage to answer with. She ran again with a ghost of her former buoyancy, and Gray Peter was held even.

Not an inch could he gain after that. Andrew saw his pursuer raise his quirt and flog. It was useless. Each horse was running itself out, and no power could get more speed out of the pounding limbs.

And with his head still turned, Andrew felt a shock and flounder. Sally had almost fallen. He jerked sharply up on the reins, and she broke into a staggering trot. Then Andrew saw that they had struck the slope of the first hill, a long, smooth rise which she would have taken at full speed in the beginning of the race, but now though she labored bitterly, she could not raise a gallop. The trot was her best effort.

There was a shrill yelling behind, and Andrew saw Dozier, a hand brandished above his head. He had seen Sally break down; Gray Peter would catch her; his horse would win that famous duel of speed and courage. Rifle? He had forgotten his rifle. He would go in, he would overhaul Sally, and then finish the chase with a play of revolvers. And in expectation of that end, Andrew drew his revolver. It hung the length of his arm; he found that his muscles were numb from the cold and the cramped position from the elbow down. Shoot? He was as helpless as though he had no gun at all. He beat his hands together to bring back the blood. He thrashed his arms against the pommel of the saddle. There was only a dull pain; it would take long minutes to bring those hands back to the point of service, and in the meantime Gray Peter galloped upon him from behind!

Well, he would let Sally do her best. For the last time he called on her; for the last time she struggled to respond, and Andrew looked back and grimly watched the stallion sweeping across the last portion of the flat ground, closer, closer, and then, at the very base of the slope, Gray Peter tossed up his head, floundered, and went down, hurling his rider over his head.

Andrew, fascinated, let Sally fall into a walk, while he watched the singular, convulsive struggles of Gray Peter to gain his feet. Hal Dozier was up again; he ran to his horse, caught his head, and at the same moment the stallion grew suddenly limp. The weight of his head dragged the marshal down, and then Andrew saw that Dozier made no effort to rise again.

He sat with the head of the horse in his lap, his own head buried in his hands, and Andrew knew then that Gray Peter was dead.