Only the battlements of the upper air, assailed in storm by the ripping of lightning, could send back such thunder as now rose from the shaking earth. But this was one long continuous roll. The movement of buffalo in unison resembled a tidal wave and the sound was that of an avalanche. The ground trembled under the thundering herd.

The eagle perched motionless on his crag, indifferent to the rolling chaos beneath him. The valley-wide cloud of dust floated low down. Time passed. Halfway to the zenith rose the sun. Then gradually the tremor of the earth and the roar of hoofs diminished, rolled, and died away. The herd had passed. On his lofty perch the eagle slept, and the valley cleared of dust and movement. Solitude, loneliness, and silence reigned at the solemn noontide.

It was spring of an era many years after the lone eagle had watched the buffalo herd.

An upland prairie country rolled and waved down from snow-capped Rocky Mountains to spread out into the immense eastern void. Over the bleached white grass had come a faint tinge of green. The warm sun had begun its renewal of the covering of the earth. A flock of wild geese, late on their annual pilgrimage, winged swift flight toward the northland. On the ridges elk grazed, and down in the hollows, where murmuring streams rushed, clouded with the blue color of melted snow, deer nibbled at the new tender shoots of grass.

Below the uplands, where the plain began, herds of buffalo dotted the patches and streaked the monotony of the gray vastness. Leagues and leagues it spread, always darker for the increase of buffalo, until all was a dense black that merged into the haze of distance.

A river wended its curving way out across the plains, and in a wooded bend an Indian encampment showed its white tepees, and red blankets, and columns of blue smoke lazily rising.

Hidden in the brush along the river half-naked red men lay in wait for the buffalo to come down to drink. These hunters did not need to sally forth for their game. They had only to wait and choose the meat and the hide that best served them for their simple needs. They did not kill more than they could use.

Along the river bank, far as eye could see, the shaggy monsters trooped down to drink. Bulls and cows and calves came in endless procession. In some places, where the bank was steep, the thirsty buffalo behind pushed the row ahead into the water, whence rose a splashing męlée. The tawny calves, still too young to shed their coats and turn the seal brown of their mothers, bawled lustily as they were shoved into the river.

Near the encampment of the Indians, where trees and brush lined the shore, the buffalo were more wary. They liked the open. But stragglers came along, and the choicest of these fell prey to the deadly arrows of the red men. A shaggy young bull, sleek and brown, superb in his approaching maturity, passed within range of the chieftain of that hunting clan. He rose from his covert, a lean, dark Indian, tall and powerful of build, with intense face and piercing eyes turned toward his quarry. He bent a bow few Indians could have drawn. He bent it till the flint head of the arrow touched his left hand. Then he released the arrow. Like a glint of light it flashed and, striking the bull behind the shoulder, buried half its length there.