There had been, just before the general advance across the Rapidan, a wholesale shaking-up of army organization. Two whole corps had been abolished, and their strength distributed among the three remaining corps. Regiments found themselves suddenly torn from their old associates, and brigaded with strangers. Their pet officers disappeared, and others took their places whom the men did not know and were disposed to dislike. To add to this discontent, there was an understanding that their leaders had been entrapped into this Wilderness fighting. Certainly it was no place which an invading army would have chosen for battle. It was a vast, sprawling forest district, densely covered with low timber, scrub-oak, dwarf junipers, and tangled cedars and pines, all knit together breast-high and upward with interlacing wild vines, and foul underfoot with swamp or thicket. In this gloomy and sinister wilderness men did not know where they were, nor whom they were fighting. Whole commands were lost in the impenetrable woods. Mounted orderlies could not get about through the underbrush, and orders sent out were never delivered. Though gulches and steep ravines abounded, cutting sharp gashes through the forest, there were no hills upon which a general and his keen-eyed staff might perch themselves and get an idea of how the land about them lay. The Confederates had plenty of this local knowledge, and used it to terrible purpose. The invaders could only put their heads down, and strive to crush their way blindly through. After a little, the drummer-boy put his snare-drum in the wagon where the other instruments were, and started off up the ridge, to see what the general and his staff had been observing earlier in the morning. As he neared the summit, he noticed that the roar of the cannon directly in front seemed to have died down a good deal. There were still angry outbursts, but one had to wait for them now; and a new kind of noise, made up of peal after peal of crackling musketry fire, was rising from the gully farther to the left. The boy had come now to the top of the ridge, only to find it crowned with a thick fringe of alders which completely shut out his view. From the roots of the farther bushes the hillside dropped precipitously. He worked his way along until, by a cleft in the rocks, an opening offered itself. Here, stooping low and bending aside the alders, he could creep out upon a big, flat, moss-grown boulder, which overhung the ravine like a balcony. He had not thought he was so high up. The other side of the gulf spread out before him could not be seen for the smoke--but the tops of tall pines growing on its bottom were far below him. The steepness of the descent made him dizzy. The rock on which he stood seemed to be suspended in mid-air. He drew back a little. Then curiosity got the upper hand. He laid himself face down on the boulder, and edged cautiously forward till he could peer over its front.