The 5th corps, General Warren commanding, was in advance on the right, and marched directly for Germania Ford, preceded by one division of cavalry, under General J. H. Wilson. General Sedgwick followed Warren with the 6th corps. Germania Ford was nine or ten miles below the right of Lee's line. Hancock, with the 2d corps, moved by another road, farther east, directly upon Ely's Ford, six miles below Germania, preceded by Gregg's division of cavalry, and followed by the artillery. Torbert's division of cavalry was left north of the Rapidan, for the time, to picket the river and prevent the enemy from crossing and getting into our rear. The cavalry seized the two crossings before daylight, drove the enemy's pickets guarding them away, and by six o'clock A.M. had the pontoons laid ready for the crossing of the infantry and artillery. This was undoubtedly a surprise to Lee. The fact that the movement was unopposed proves this.

Burnside, with the 9th corps, was left back at Warrenton, guarding the railroad from Bull Run forward to preserve control of it in case our crossing the Rapidan should be long delayed. He was instructed, however, to advance at once on receiving notice that the army had crossed; and a dispatch was sent to him a little after one P.M. giving the information that our crossing had been successful.

The country was heavily wooded at all the points of crossing, particularly on the south side of the river. The battle-field from the crossing of the Rapidan until the final movement from the Wilderness toward Spottsylvania was of the same character. There were some clearings and small farms within what might be termed the battle-field; but generally the country was covered with a dense forest. The roads were narrow and bad. All the conditions were favorable for defensive operations.

There are two roads, good for that part of Virginia, running from Orange Court House to the battle-field. The most southerly of these roads is known as the Orange Court House Plank Road, the northern one as the Orange Turnpike. There are also roads from east of the battle-field running to Spottsylvania Court House, one from Chancellorsville, branching at Aldrich's; the western branch going by Piney Branch Church, Alsop's, thence by the Brock Road to Spottsylvania; the east branch goes by Gates's, thence to Spottsylvania. The Brock Road runs from Germania Ford through the battle-field and on to the Court House. As Spottsylvania is approached the country is cut up with numerous roads, some going to the town direct, and others crossing so as to connect the farms with roads going there.

Lee's headquarters were at Orange Court House. From there to Fredericksburg he had the use of the two roads above described running nearly parallel to the Wilderness. This gave him unusual facilities, for that country, for concentrating his forces to his right. These roads strike the road from Germania Ford in the Wilderness.

As soon as the crossing of the infantry was assured, the cavalry pushed forward, Wilson's division by Wilderness Tavern to Parker's store, on the Orange Plank Road; Gregg to the left towards Chancellorsville. Warren followed Wilson and reached the Wilderness Tavern by noon, took position there and intrenched. Sedgwick followed Warren. He was across the river and in camp on the south bank, on the right of Warren, by sundown. Hancock, with the 2d corps, moved parallel with Warren and camped about six miles east of him. Before night all the troops, and by the evening of the 5th the trains of more than four thousand wagons, were safely on the south side of the river.

There never was a corps better organized than was the quartermaster's corps with the Army of the Potomac in 1864. With a wagon-train that would have extended from the Rapidan to Richmond, stretched along in single file and separated as the teams necessarily would be when moving, we could still carry only three days' forage and about ten to twelve days' rations, besides a supply of ammunition. To overcome all difficulties, the chief quartermaster, General Rufus Ingalls, had marked on each wagon the corps badge with the division color and the number of the brigade. At a glance, the particular brigade to which any wagon belonged could be told. The wagons were also marked to note the contents: if ammunition, whether for artillery or infantry; if forage, whether grain or hay; if rations, whether, bread, pork, beans, rice, sugar, coffee or whatever it might be. Empty wagons were never allowed to follow the army or stay in camp. As soon as a wagon was empty it would return to the base of supply for a load of precisely the same article that had been taken from it. Empty trains were obliged to leave the road free for loaded ones. Arriving near the army they would be parked in fields nearest to the brigades they belonged to. Issues, except of ammunition, were made at night in all cases. By this system the hauling of forage for the supply train was almost wholly dispensed with. They consumed theirs at the depots.

I left Culpeper Court House after all the troops had been put in motion, and passing rapidly to the front, crossed the Rapidan in advance of Sedgwick's corps; and established headquarters for the afternoon and night in a deserted house near the river.

Orders had been given, long before this movement began, to cut down the baggage of officers and men to the lowest point possible. Notwithstanding this I saw scattered along the road from Culpeper to Germania Ford wagon-loads of new blankets and overcoats, thrown away by the troops to lighten their knapsacks; an improvidence I had never witnessed before.

Lee, while his pickets and signal corps must have discovered at a very early hour on the morning of the 4th of May, that the Army of the Potomac was moving, evidently did not learn until about one o'clock in the afternoon by what route we would confront his army. This I judge from the fact that at 1.15 P.M., an hour and a quarter after Warren had reached Old Wilderness Tavern, our officers took off rebel signals which, when translated, were seen to be an order to his troops to occupy their intrenchments at Mine Run.