Once again, but sluggishly, as if oppressed by apprehensions which they could not understand, the humped and lion-fronted herds of the bison began to gather for the immemorial southward drift. Harassed of late years by new and terrible enemies, their herds had been so thinned and scattered that even to the heavy brains of the fiercer old bulls a vague idea of caution was beginning to penetrate. Hitherto it had been the wont of the colossal hordes to deal with their adversaries in a very direct and simple fashion—to charge and thunder down upon them, to roll over them in an irresistible flood of angry hooves, and trample them out of existence. Against the ancient enemies this straightforward method of warfare had been efficacious enough, and the herds had multiplied till the plains were black with their marching myriads. But against the new foe—the white man, with his guns and his cunning, his cool courage and his insatiable greed—it had been a destructive failure. The mightier their myriads, the more irresistible the invitation to this relentless slaughterer; and they had melted before him. At last a new instinct had begun to stir in their crude intelligences, an instinct to scatter, to shun the old, well-worn trails of migration, to seek pasturage in the remoter valleys and by small streams where the white man's foot had not yet trespassed. But as yet it was no more than the suggestion of an instinct, too feeble and fumbling to sway the obstinate hordes. It had come to birth too late. Here and there a little troop—perhaps half a dozen cows under the lordship of some shaggy bull more alert and supple-witted than his fellows—resisted the summons to assemble, and slipped off among the wooded glades. But the rest, uneasy, yet uncomprehending, obeyed the ancestral impulse and gathered till the northern plains were black with them.

Then the great march began, the fateful southward drift.

The horde of the giant migrants was not a homogeneous mass, as it would have seemed to one viewing it from a distance and a height. It was made up of innumerable small herds, from a dozen to thirty or forty bison in each. Each of these little groups hung together tenaciously, under the dominance of two or three old bulls, and kept at a certain distance, narrow but appreciable, from the herds immediately neighboring it. But all the herds drifted southward together in full accord, now journeying, now halting, now moving again, as if organized and ordered by some one central and inflexible control. Rival bulls roared their challenges, pawed the earth, fought savage duels with their battering fronts and short, ripping horns, as they went; but always onward they pressed, the south with its sun-steeped pastures drawing them, the north with its menace of storm driving them before it. And the sound of their bellowings and their tramplings rose in a heavy thunder above their march, till the wide plain seemed to rock with it.

Countless as was their array, however, they seemed dimly conscious, with a sort of vague, communal, unindividual sort of perception, that their numbers and their power were as nothing in comparison with the migrations of preceding autumns. The arrogance of irresistible might had passed from them. They went sullenly, as if under a cloud of dark expectation. And the separate herds hung closer to their neighbors than had hitherto been the custom in the horde, as if seeking reassurance against an unknown threat.

All around the far-flung outskirts of the host ran, skulking and dodging, its accustomed, hereditary foes—the little slim, yellow-gray coyotes and the gaunt timber wolves. The coyotes, dangerous only to the dying or to very young calves separated from their mothers, were practically ignored, save for an occasional angry rush on the part of some nervous cow; and, trusting to their amazing speed, they frequently ran far in among the herds, in the hope of spotting some sick animal and keeping it in view till the host should pass on and leave it to its fate. The great gray timber wolves, however, were honored with more attention. Powerful enough alone to pull down a yearling calf, they were always watched with savage and apprehensive eyes by the cows, and forced to keep their distance. The stragglers, old and young, were their prey, or sometimes a wounded bull, worsted in battle and driven from his herd, and weak from loss of blood. In twos and threes they prowled, silent and grimly watchful, hanging on the flanks of the host or picking their way in its vast, betrampled, desolated trail.

On the outermost edge of the right or western wing of the bellowing host went a compact little herd, which hung together with marked obstinacy. It consisted of a dozen cows with their calves and yearlings, and two adult bulls, one of which, the younger and less heavily maned, kept diffidently at the rear and seemed to occupy the busy but subordinate post of a sort of staff-sergeant. The other was an immense bull, with splendid leonine front and with a watchful, suspicious look in his eyes which contrasted sharply with the sullen stare of his fellows. He had the wisdom learned in many eventful migrations, and he captained his herd imperiously, being sure, in the main, as to what was best for them. But of just one thing he seemed somewhat unsure. He appeared irresolute as to the southward march or else as to the companionship of the host. By hanging upon the skirts of it, he held himself ready to detach his little herd from its company and make off among the foothills in case of need. At the same time, by thus keeping on the outskirts of the host he secured for his little knot of satellites the freshest and sweetest pasturage.

However disquieting the brown bull's apprehensions, they were too vague to let him know what it was he feared. For the accustomed perils of the march he entertained just so much dread as befitted a sagacious leader—no more. The skulking coyotes he disdained to notice. They might skulk or dart about like lean shadows, as near the herd as the jealous cows would permit, and he would never trouble to shake the polished scimitars of his horns at them. The great gray wolves he scorned; but, with perhaps a dim prevision of the day when he should be old and feeble, and driven out from the herd, he could not ignore them. He chased them off angrily if they ventured within the range of his attention. But against an enemy whom he had learned to respect, the Indian hunters, he kept an untiring watch, and the few white hunters, who had already so thinned the bison host, he remembered with a fear which was mingled with vengeful resentment. Nevertheless, even his well-grounded fear of those human foes was not enough to account for his almost panicky forebodings. These enemies, as he had known them, struck always on the flanks of the host; and he had tactics to elude even the dreadful thunder and spurted lightning of their guns. His fear was of he knew not what and therefore it ground remorselessly upon his nerves.

For the present, however, there were none of these human enemies near, and the host rolled on southward, with its bellowings and its tramplings, unmolested. Neither Indians nor white men approached this stage of the migration. The autumn days were sunny, beneath a sky bathed in dream. The autumn nights were crisp with tonic frost, and in the pink freshness of the dawn a wide-flung mist arose from the countless puffing nostrils and the frost-rimed, streaming manes. Pasturage was abundant, the tempers of the great bulls were bold and pugnacious, and nothing seemed less likely than that any disaster could menace so mighty and invincible a host. Yet Brown Bull was uneasy. From time to time he would lift his red-rimmed nostrils, sniff the air in every direction, and scan the summits of the foothills far on the right, as if the unknown peril which he apprehended was likely to come from that direction.

As day by day passed on without event, the diffused anxiety of the host quite died away. But Brown Bull, with his wider sagacity or more sensitive intuition, seemed to grow only the more apprehensive and the more vigilant. His temper did not improve under the strain, and his little troop of followers was herded with a severity which must have taxed, for the moment, their faith in its beneficence.

The host lived, fought, fed, as it went, halting only for sleep and the hours of rest. In this inexorable southward drift the right flank passed one morning over a steep little knoll, the crest of which chanced to be occupied by Brown Bull and his herd just at the moment when the moving ranks came to a halt for the forenoon siesta. It was such a post of vantage as Brown Bull loved. He stood there sniffing with wide, wet nostrils, and searching the horizon for danger. The search was vain, as ever; but just behind him, and closer in toward the main body of the host, he saw something that made his stretched nerves thrill with anger. An old bull had just been driven out from a neighboring herd, deposed from his lordship and hideously gored by a younger and stronger rival. Staggering from his wounds, and overwhelmed with a sudden terror of isolation, he tried to edge his way into the herd next behind him. He was ejected mercilessly. From herd to herd he staggered, met always by a circle of lowered horns and angry eyes, and so went stumbling back to that lonely doom which, without concern, he had seen meted out to so many of his fellows, but had never thought of as possible to himself. This pitiful sight, of course, was nothing to Brown Bull. It hardly even caught his eye, still less his interest. Had he been capable of formulating his indifferent thoughts upon the matter, they would have taken some such form as: "Serve him right for being licked!" But when at last the wounded outcast was set upon by four big timber wolves and pulled, bellowing, to his knees, that was another affair. Brown Bull could not tolerate the sight of the gray wolves triumphing. With a roar of rage he charged down the knoll. His herd, astonished but obedient, lowered their massive heads and charged at his heels. The wolves snarled venomously, forsook their prize, and vanished. Brown Bull led the charge straight on and over the body of the dying outcast, trampling it into dreadful shapelessness. Then, halting abruptly, he looked about him in surprise. The wolves were gone. His rage passed from him. He led his followers tranquilly back to their place on the knoll, to the accompaniment of puzzled snortings from the neighbor herds.

The herd fell to feeding at once, as if nothing in the least unusual had happened. But Brown Bull, after cropping the sweet, tufted grass for a few minutes, was seized with one of his pangs of apprehension, and raised his head for a fresh survey of the distance. This time he did not resume his feeding, but stood for several minutes shifting his feet uneasily until he had quite satisfied himself that the ponies which he saw emerging from a cleft in the foothills were not a harmless wild troop, but carried each a red rider. He had reached the Indian country, and his place on the flank of the host, as his craft and experience told him, was no longer a safe one.

For a little, Brown Bull stood irresolute, half inclined to lead his followers away from the host and slip back into the wooded foothills whence they had come. Then, either moved by a remembrance of the harsh winter of the north, or drawn by the pull of the host upon his gregarious heart, he lost the impulse. Instead of forsaking the host, he led his herd down the knoll and insinuated it into a gap in the ranks.

Here Brown Bull was undoubtedly a trespasser. But instead of forcing a combat or, rather, a succession of combats, he contented himself with holding his straitened ground firmly rather than provocatively. His towering bulk and savage, resolute bearing made the nearest bulls unwilling to challenge his intrusion. Little by little the herds yielded way, half unconsciously, seeking merely their own convenience. Little by little, also, Brown Bull continued his crafty encroachments, till at length, after perhaps a couple of hours of maneuvering, he had his charges some four or five hundred yards in from the exposed flank and well placed near the front of the march, where the pasturage was still sweet and untrampled.

The Indians, sweeping up on their mad ponies, rode close to the flank of the host and chose their victims at leisure. Killing for meat and not for sport, they selected only young cows in good condition, and were too sparing of their powder to shoot more than they needed. They clung to the host for some hours, throwing the outer fringe of it into 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 unshaken, and kept drifting steadily southward. It began to look as if, in spite of Fate, a mighty remnant would yet make good its way into the broken country, dangerous with hostile Indians, whither the white hunters would hesitate to pursue. It was decided, therefore, to check the southward march of the host by splitting it up into sections and scattering it to this side and that, thus depriving it of the united migrant impulse, and leaving its destruction to be completed at more leisure.

These men knew the bison and his deep-rooted habits. In knots of three and four they stationed themselves, on their ponies, directly in the path of the advancing host.

On the flanks they attracted small attention. But directly in front, the sight of them aroused the leaders of the march to fury. They pawed the ground, snorted noisily, and then charged with their massive heads low down. And the whole host, with sudden rising rage, charged with them. It looked as if those little knots of waiting men and ponies must be annihilated.

But when that dark, awful torrent of rolling manes, wild eyes, keen horns, and shattering hoofs drew close upon the waiting groups of men, these lifted their guns and fired, one after the other, straight in the faces of the nearest bulls.

The result was instantaneous, as usual. Whether, as in most cases, the leaders fell, or, as in other instances, they escaped, the rolling torrent split and parted at once to either side as if the flame and roar from the muzzles of the guns had been so many shoulders of rock. Once divided, and panic-stricken by finding their foes at the heart of their array, the herds went to pieces hopelessly, and were easily driven off toward all points of the compass.

But in one instance—just one—the plan of the slaughterers did not work out quite as anticipated.

Three of the hunters had taken station exactly opposite the center of the host. Brown Bull and his herd were immediately behind the front rank at this point. When the great charge was met by the roar and the spirting flames, the leading bull went down, and the front rank split, as a matter of course, to pass on either side of this terrifying obstacle. But Brown Bull seemed to feel that here and now, straight before him, was the unknown peril which had been shaking his heart throughout the whole long march. In this moment his heart was no more shaken, and the tradition of his ancestors, which bade him follow his leaders like a sheep, was torn up by the roots. He did not swerve, but swept down straight upon the astonished knot of horsemen; his trusting herd came with him; and all behind, as usual, followed blindly.

"The shambles of the plain."

The three white men turned to flee before the torrent of death. But Brown Bull caught the leader's pony in the flank, ripped it and bore it down, passing straight on over the bodies, which, in a dozen seconds, were hardly to be distinguished from the earth to which they had so suddenly and so awfully been rendered back. Of the other two, one made good his escape, because his pony had taken alarm more quickly than its master and turned in time. The third was overtaken because a cow which he had wounded stumbled in his way, and he and his pony went out along with her beneath the hoofs of Brown Bull's herd.

Brown Bull gave no heed to his triumph, if, indeed, he realized it at all.

What he realized was that the apprehended doom had fallen upon the host, and the host was no more. He kept on with his long, lumbering gallop, till he had his herd well clear of all the struggling remnants of the host, which he saw running aimlessly this way and that, the slaughterers hanging to them like wolves. The sight did not interest him, but, as it covered the whole plain behind him, he could not escape it if he looked back. Forward the way was clear. Far forward and to the right, he saw woods and ridgy uplands, and purple-blue beyond the uplands a range of ragged hills. Thither he led his herd, allowing them not a moment to rest or pasture so long as the shambles of the plain remained in view. But that night, the tiny, lonely remnant of the vanished myriads of their kin, they fed and slept securely in a well-grassed glade among the hills.