The tornado moved. It swept at the top jump of ponies used to the chase of the buffalo, as sudden and terrible and imminent as the loom of a black cloud on the wings of storm, and, like it, seeming to gather speed and awfulness as it rushed nearer. Each rider bent low over his pony's neck and shot--a hail of bullets, which, while most passed too high, nevertheless shrieked and spun through the volume of coarser sound. The ponies stretched their necks and opened their red mouths and made their little feet go with a rapidity that twinkled as bewilderingly as a picket-fence passing a train. And the light snow swirled and eddied behind them. The two men behind the dead horse were not deceived by this excitement into rising to their knees. They realised that this was the critical point in the fight, and they shot hard and fast, concentrating all the energy of their souls into the steady glare of their eyes over the sights of the smoking rifles. In a moment the foremost warrior was trying to leap his pony at the barrier before him, but the little animal refused the strange jump and shied to the left, cannoning and plunging into the stream of braves rushing in on that side. Into the confusion Alfred emptied the last two shots of his Winchester, and was fortunate enough merely to cripple a pony with one of them. The kicking, screaming, little beast interposed a momentary but effective barrier between the sheriff and his foes. A rattling fire from one of his six-shooters into the brown of the hesitating charge broke it. The self-induced excitement ebbed, and the Indians swerved and swept on by. On the other side, the outlaw had also managed to kill a pony within a few feet of the impromptu breastwork, and, direct riding-down being thus prevented in front, he was lying stretched on his side, coolly letting off first one revolver then the other in the face of imminent ruin. Alfred's attentions, however, and the defection of the right wing, drove these savages, too, into flight. Miraculously, neither man was more than scratched, though their clothes and the ground about them showed the marks of bullets. Strangely enough, too, the outlaw's other pony stood unhurt at a little distance whither the rush of the charge had carried him. Alfred arose and drove him back. Then both men made a triangular breastwork of the two dead horses and their saddles. "Cyan't do that more'n once," observed the outlaw, taking a long breath. "They don't want her more'n once," replied Alfred, sagely.