But again he was aroused. He whipped up his head. The sound was thundering in his ears. He heard trampling hoofs--many hoofs--immediately outside. He leaped to his feet. He saw horsemen--Indians--the renegades--crowding past, riding frantically to the north. He called sharply to the others, who were already waking and leaping to their feet. He turned to the horses. They were all there, standing now, alert and tense. Wheeling, he stared after the Indians. They were speeding away like the wind, close huddled, fleeing in a panic. He watched them, dazed, saw them ascend a rise, become a vacillating speck in the moonlight, and drop from view in a hollow beyond the rise. He turned to the men. All stood in mute helplessness, only half comprehending. He opened his mouth to speak, but as he did so there came a sudden interruption. It was a bugle-call, rollicking across the desert, crashing into the death-like hush which had settled upon the camp. He turned his eyes toward the sound--to the south. Over a giant sand-dune, riding grouped, with one or two in the lead, swept a company of cavalrymen. Down the slope they galloped, moonlight playing freely upon them, bringing out every detail--the glint of arms, the movement of hat-brims, the lift and fall of elbows--pounding straight for the camp. Another blast of the bugle, crisp and metallic, and they swerved; they drew near, nearer still, came close on the right, and swept past in a whirlwind of sounds, thundering hoofs, cursing men, slamming carbines, creaking saddles, snorting horses. So they swept on into the north, pushing, crowding, jostling, throwing back flying gravel, odors of sweat, swirling dust-clouds. They mounted rapidly over the rise, and became, as the pursued, vacillating specks, and then disappeared in the hollow beyond. Stephen recovered himself. He swept his eyes again over the horses. He saw a change among them. Three were calm, but not the other two. Both of them were weaving faintly, and, even as he sprang to them, one sank slowly to the ground. Wondering, dazed, gripped in apprehension, he bent over it. The horse was a stranger, and it was gasping its last breath. Dismayed, he turned to the other. This horse also was a strange horse, and it was white with foam and panting, also run to death. Astonished, cold with apprehension, he looked for Pat. But neither Pat nor the sorrel was to be seen. Then the truth overwhelmed him. The renegades, seeing fresh horses here, had made a swift change. Pat was gone! For one tense moment he stood spellbound. Then he sprang into action. He dressed as best he could, called to the others to bridle and saddle a horse, and leaped into the saddle. His whole body rebelled at the movement. But he set his jaw grimly, and, clutching at his bandaged arm, yet keeping his grip on the reins, he spurred frantically after the cavalry. As he dashed away he shouted back his purpose. But the men, standing with wide eyes turned after him, heard only the end: