The official reports to the Adjutant-General's office in Washington show that on the 20th of April the Army of the Potomac numbered 81,864 men present and fit for duty. Burnside's corps, which joined in the Wilderness, added to this force 19,250 men, making a total of 101,114 men. After the Wilderness, a division numbering 7000 or 8000 men under General Tyler joined it. When the Chickahominy was reached, a junction with Butler's army, 25,000 strong, was made. Lee had on the 20th of April present for duty, armed and equipped, 53,891. A few days later he was reinforced by Longstreet's corps, which on the date given numbered 18,387, making a total of 72,278. Grant's army outnumbered Lee's, but he was to make an offensive campaign in the enemy's country, operating on exterior lines, and keeping long lines of communication open. Defending Richmond and Petersburg there were other Confederate forces, under Beauregard, Hill, and Hoke, estimated to amount to nearly 30,000 men, and Breckenridge commanded still another army in the Shenandoah Valley. In Grant's command, but not of the Army of the Potomac, were the garrison of Washington and the force in West Virginia. On the 3d of May the order to move was given, and at midnight the start was made. The advance guard crossed the river before four in the morning of the 4th, and on the morning of the 5th Grant's army, nearly a hundred thousand strong, was disposed in the Wilderness. Lee had discovered the movement promptly, and had moved his whole army to the right, determined to fall upon Grant in that unfavorable place. As soon as the Union army began a movement in the morning, it encountered the enemy, who attacked with tremendous and confident vigor. The fighting continued all day, with indecisive results. Early the next morning the battle was renewed, and continued with varying fortunes, at one time one army, and at another time the opposing army, having the advantage. There was, in fact, a series of desperate battles between different portions of the two armies which did not end until the night was far advanced. The advantage, on the whole, was with the Union army. It had not been forced back over the Rapidan. It stood fast. But it had inflicted no such defeat on the enemy as Grant had hoped to do in the first encounter. The losses of both sides had been very large, those of the Union Army being 3288 killed, 19,278 wounded, 6784 missing.