Riding at ease in the lazy afternoon sunshine a single troop of cavalry was threading its way in long column of twos through the bold and beautiful foothills of the Big Horn. Behind them, glinting in the slanting rays, Cloud Peak, snow clad still although it was late in May, towered above the pine-crested summits of the range. To the right and left of the winding trail bare shoulders of bluff, covered only by the dense carpet of bunch grass, jutted out into the comparative level of the eastward plain. A clear, cold, sparkling stream, on whose banks the little command had halted for a noontide rest, went rollicking away northeastward, and many a veteran trooper looked longingly, even regretfully, after it, and then cast a gloomy glance over the barren and desolate stretch ahead. Far as the eye could reach in that direction the earth waves heaved and rolled in unrelieved monotony to the very sky line, save where here and there along the slopes black herds or scattered dots of buffalo were grazing unvexed by hunters red or white, for this was thirty years ago, when, in countless thousands, the bison covered the westward prairies, and there were officers who forbade their senseless slaughter to make food only for the worthless, prowling coyotes. No wonder the trooper hated to leave the foothills of the mountains, with the cold, clear trout streams and the bracing air, to take to long days' marching over dull waste and treeless prairie, covered only by sage brush, rent and torn by dry ravines, shadeless, springless, almost waterless, save where in unwholesome hollows dull pools of stagnant water still held out against the sun, or, further still southeast among the "breaks" of the many forks of the South Cheyenne, on the sandy flats men dug for water for their suffering horses, yet shrank from drinking it themselves lest their lips should crack and bleed through the shriveling touch of the alkali.