confusion, but attracting little attention from the herds beyond their reach. Once in a while some bull, more fiery than his fellows, would charge with blind, uncalculating valor upon these nimble assailants, only to be at once shot down for his hide. But for the most part, none but those herds actually assailed paid much attention to what was going on. They instinctively crowded away from the flying horsemen, the flames and thunder of the guns. But their numbers and the nearness of their companions seemed to give them a stolid sense of security even when the swift death was almost upon them. As for Brown Bull, all this was just what he had expected and made provision against. The assault came nowhere near his own charges, so he treated it as none of his affair.

The Indians withdrew long before nightfall; but the following day brought others, and for a week or more there was never a day without this harassing attack upon one flank or another of the host, or sometimes upon both flanks at once. Again and again, as the outer ranks dwindled, Brown Bull found himself nearing the danger zone, and discreetly on each occasion he worked his herd in a few hundred yards nearer the center.

Then, for a space of some days, the attacks of the Indians ceased, and the wolves and coyotes came back to dog the trail of the diminished host. But Brown Bull was not unduly elated by this respite. He held his followers to their place near the center of the march, and maintained his firm and apprehensive vigilance untiringly. The days were now hot and cloudless, and so dry that the host seemed literally to drink up every brook or pond it passed, and an irritating dust-cloud overhung the rear of the trampling hoofs.

But these few days of peace were but prelude to harsher trial. From somewhere far to the left came now a band of white hunters, who rode around the host and attacked it on both flanks at once. They killed more heedlessly and brutally than the Indians, for the sake of the hides rather than for meat, each man hurriedly marking his own kill and then dashing on to seek more victims. Each night they camped, and in the cool of the morning overtook the slow-moving host on their tireless mustangs. The trail of stripped red carcasses which they left behind them glutted all the wolves, coyotes, and carrion crows for leagues about, and affronted the wholesome daylight of the plains. This visitation lasted for five or six days, and the terror it created spread inwards to the very heart of the host. Gradually the host quickened its march, leaving itself little time for feeding and only enough rest for the vitally essential process of rumination. At last the white marauders, satiated with slaughter, dropped behind, and immediately the host, now shrunken by nearly a third, slackened its pace and seemed to forget its punishment. Phlegmatic and short of memory, the herds were restored to content by a day of heavy rain, which laid the dust, and freshened their hides, and instilled new sweetness into the coarse plains grasses. But Brown Bull's apprehensions redoubled, and he grew lean with watching.

The path of migration—the old path, known to the ancestors of this host for many generations—now led for many days along the right bank of a wide and turbulent but usually shallow river. The flat roar of the yellow flood upon its reefs and sand banks, mixed with the bellowings and tramplings of the host to form a thunder which could be heard in the far-off foothills, transmuted there to a murmur like the sea.

There came now a day of intense and heavy heat, with something in the air which made the whole host uneasy. They stopped pasturing, and the older bulls and cows sniffed the dead air as if they detected some strange menace upon it. Toward the middle of the afternoon a mysterious haze, of a lovely rosy saffron hue, appeared in the southeast beyond the river. It spread up the hot, turquoise-blue sky with a terrifying rapidity, blotting out the empty plain as it approached. Soon all the eyes of the host were turned upon it. Suddenly, at the heart of the rosy haze, a gigantic yellow-black column took shape, broad at the base and spreading wide at the summit, till it lost itself in a swooping canopy of blackish cloud. It drew near at frightful speed, spinning as it came, and licking up the surface of the plain beneath.

Brown Bull, whose herd was just now in the front rank of the host, stood motionless for some seconds, till he had judged the exact direction of the spinning column. Then, with a wild bellow, he lunged forward at a gallop, apparently to meet the oncoming doom. His herd charged close at his heels, none questioning his leadership, and the whole host followed, heads down, blind with panic.

Two or three minutes more, and the sky overhead was darkened. An appalling hum, as of giant wires, drowned the thunder of the galloping host. The hum shrilled to a monstrous and rending screech, and the spinning column swept across the river, wiping it up to the bottom of the channel as it passed. Brown Bull's herd felt a sickening emptiness in their lungs, and then a wind which almost lifted them from their feet; and their knees failed them in their terror. But their leader had calculated cunningly, and they were well past the track of doom. The cyclone caught the hinder section of the host diagonally, whirled it into the air like so many brown leaves, and bore it onward to be strewn in hideous fragments over the plain behind. Immediately the sky cleared. There was no more wind, but a chilly, throbbing breath. The yelling of the cyclone sank away, and the river could be heard once more brawling over its reefs and bars. A full third of the host had been blotted from existence. The survivors, still trembling, remembered that they were hungry, and fell to cropping the gritty and littered grass.

On the following day the shrunken host forded the river, which at this point turned sharply westward across the path of the migration. The river had risen suddenly owing to a cloudburst further up its course, and many of the weaklings and youngsters of the host were swept away in the passage. But Brown Bull's herd, well guarded and disciplined, got over without loss; and for the next few days, there being no peril in sight, its wary captain suffered it to lead the march.

And now they came into a green and fertile and well-watered land, where it would have been comforting to linger and recover their strength. But here, once more, the white man came against them.

At the first signs of these most dreaded foes, Brown Bull had discreetly edged his herd back a little way into the host, so that it no longer formed the vanguard. The white men killed savagely and insatiably all along both flanks, as if not the need of hides and meat, but the sheer lust of killing possessed them. One hunter, whose pony had stepped into a badger-hole and fallen with him, was gored and trampled by a wounded bull. This fired his comrades to a more implacable savagery. They noticed that the host was a scanty one compared with the countless myriads of preceding years. "Them redskins up north have been robbing us!" they shouted, with fine logic. Then they remembered that the migrating herds were anxiously awaited by other tribes of Indians further south, who largely depended upon the bison for their living. An inspiration seized them. "Let's fix the red varmints! If we jest wipe these 'ere buffalo clean out, right now, the redskins'll starve, an' this country'll be well quit o' them!"

But strive as they might to carry out this humane intention, for all their slaughter on the flanks, the solid nucleus of the host remained