On the day after the start, Hancock crossed the Mattapony River at one point and Warren at another. Hancock was ordered to take position on the right bank and, if practicable, to attack the Confederates wherever found. By the 22d, Wright and Burnside came up and the march proceeded. But the vigilant Lee had again detected the plans of his adversary. Meade's army had barely started in its purpose to turn the Confederates' flank when the Southern forces were on the way to block the army of the North. As on the march from the Wilderness to Spotsylvania, Lee's troops took the shorter route, along main roads, and reached the North Anna ahead of the Federals. Warren's corps was the first of Meade's army to arrive at the north bank of the river, which it did on the afternoon of May 23d. Lee was already on the south bank, but Warren crossed without opposition. No sooner had he gotten over, however, than he was attacked by the Confederates and a severe but undecisive engagement followed. The next morning (the 24th) Hancock and Wright put their troops across at places some miles apart, and before these two wings of the army could be joined, Lee made a brilliant stroke by marching in between them, forming a wedge whose point rested on the bank, opposite the Union center, under Burnside, which had not yet crossed the river. The Army of the Potomac was now in three badly separated parts. Burnside could not get over in sufficient strength to reënforce the wings, and all attempts by the latter to aid him in so doing met with considerable disaster. The loss in these engagements approximated two thousand on each side. On the 25th, Sheridan and his cavalry rejoined the army. They had been gone since the 9th and their raid was most successful. Besides the decisive victory over the Confederate cavalry at Yellow Tavern, they had destroyed several depots of supplies, four trains of cars, and many miles of railroad track. Nearly four hundred Federal prisoners on their way to Richmond had been rescued from their captors. The dashing cavalrymen had even carried the first line of work around Richmond, and had made a detour down the James to communicate with General Butler. Grant was highly satisfied with Sheridan's performance. It had been of the greatest assistance to him, as it had drawn off the whole of the Confederate cavalry, and made the guarding of the wagon trains an easy matter.