They set out on horseback, their scanty baggage and their stock of presents being no doubt carried by pack-animals. Their general course was west-southwest, with the Black Hills at a distance on their left, and the upper Missouri on their right. The country was a rolling prairie, well covered for the most part with grass, and watered by small alkaline streams creeping towards the Missouri with an opaque, whitish current. Except along the watercourses, there was little or no wood. “I noticed,” says the Chevalier de la Vérendrye, “earths of different colors, blue, green, red, or black, white as chalk, or yellowish like ochre.” This was probably in the “bad lands” of the Little Missouri, where these colored earths form a conspicuous feature in the bare and barren bluffs, carved into fantastic shapes by the storms.[25] For twenty days the travellers saw no human being, so scanty was the population of these plains. Game, however, was abundant. Deer sprang from the tall, reedy grass of the river bottoms; buffalo tramped by 24 in ponderous columns, or dotted the swells of the distant prairie with their grazing thousands; antelope approached, with the curiosity of their species, to gaze at the passing horsemen, then fled like the wind; and as they neared the broken uplands towards the Yellowstone, they saw troops of elk and flocks of mountain-sheep. Sometimes, for miles together, the dry plain was studded thick with the earthen mounds that marked the burrows of the curious marmots, called prairie-dogs, from their squeaking bark. Wolves, white and gray, howled about the camp at night, and their cousin, the coyote, seated in the dusk of evening upright on the grass, with nose turned to the sky, saluted them with a complication of yelpings, as if a score of petulant voices were pouring together from the throat of one small beast. On the eleventh of August, after a march of about three weeks, the brothers reached a hill, or group of hills, apparently west of the Little Missouri, and perhaps a part of the Powder River Range. It was here that they hoped to find the Horse Indians, but nobody was to be seen. Arming themselves with patience, they built a hut, made fires to attract by the smoke any Indians roaming near, and went every day to the tops of the hills to reconnoitre. At length, on the fourteenth of September, they descried a spire of smoke on the distant prairie.