With the horses at the very end of the tethers the trail boys let them drift over the rise and out upon the plain. It was noon and they were hungry, so they began to graze immediately. Whenever the buffaloes caught sight of the two horses, they were quietly feeding on the short grass, and moving on like themselves—up wind. A plains-bred or mountain-bred horse will always point into the wind when grazing, just as instinctively, as any game animal. What the buffaloes did not see was the long line dragging behind each horse. At the end of the lines were the boys, creeping on hands and knees, or lying flat for a time on the prairie, to breathe. The horses made a perfect screen for the young hunters. Chet’s plan included the stalking of the buffaloes to within easy striking distance. Then they were to spring into the saddles, cast free the ropes, and shoot from that vantage seat—following the herd on horseback if necessary, for a second shot. It seemed as though the plan would go through without a hitch. The horses were kept moving by the boys at the end of the ropes; but they did nothing to startle Hero and Poke. Holding the rope in one hand, each boy dragged behind him with the other his heavy rifle. If the buffaloes glanced toward the horses they would see no farther than the saddle mounts themselves. That is the way with creatures of the wild. With all their apprehension of an approaching enemy, they are satisfied of their own safety if some other creature intervenes between them and the enemy. The quietly grazing horses made the buffaloes perfectly tranquil. The young hunters were making a successful approach. The big leader of the herd was on the far side; but Chet Havens had his mind made up to try for that very individual. It would be a feather in his cap indeed if he brought down the big bull. There were two calves with the buffaloes; but they were of grazing age. Chet was quite sure that these calves would not keep the herd back much if once it should bolt. The horses and their owners drew nearer and nearer. Chet had planned to come upon the buffaloes a little to one side instead of from the immediate rear. This was so the game would not have to swing their heads around to see the horses. The more familiar they became with the sight of the grazing horses the less likely the herd was to stampede. At the right hand—the southeast—was a considerable thicket. Chet had noticed this in the beginning; but he did not consider it a good vantage point from which to stalk the herd. He was aiming almost directly for it. He would, however, have given considerable for just the protection that thicket afforded as the moment for him and Dig to mount drew near. The boys signalled each other without speaking. Chet assured Dig that he was going to try for the big bull while Dig signalled that he would be satisfied with a much smaller animal and pointed out one of the young males, nearer at hand.