We of the Fifth are marching down the left or western bank of the Rosebud to-day, somewhat independently as regards the rest of the cavalry brigade, which, following the infantry, is away across the valley, close under the slopes and hillsides towards the east. About nine in the morning, while I am profiting by a ten-minute halt to jot in my note-book some of the surrounding topographical features, my orderly and myself climb to the top of the ridge on our left, from which a good view of the country is to be had. Just here the valley runs northeast, and we have been pursuing that general direction for the last day's march; but right ahead, some two thousand yards, a tall bluff juts out into the valley from the west. The river sweeps round its base in a broad fringe of cottonwoods, and disappears from sight for six or eight miles; then, over an intervening range, I see it again, away to the north, making straight for what must be the valley of the Yellowstone. Between that great bend of the river and the distant bluffs on the eastern side, a broad plain, scorched and blistered by sun and Indian fire, stretches away some two or three miles in width. This side of the bend the slopes gradually near the stream, and the picture below me is a very pretty one. Right under our ridge the Fifth Cavalry, in long column, is just preparing to remount and move on. A mile away to the eastward are our brethren of the Second and Third; a quarter of a mile ahead of them, the compact battalion of infantry. Here and there groups of horses, men, and a fluttering flag indicate the positions in march of Generals Crook and Merritt. Half a mile in advance of all, those little dots of horsemen are our scouts, while, anyhow and everywhere, in no order whatsoever, our Crows and Shoshones are scattered along the column on one flank, while the pack-mules kick up a thick dust on the other. The cloud of dust, in fact, rises from the whole column, and extends way back up the Rosebud, and even as I am wondering how far it can be seen, my eye is attracted by just as thick a cloud around the point, apparently coming up the valley. What the mischief can that be?