Up to this time Wilson had heard nothing of the approach of the Fifth Corps, and the situation becoming threatening, he withdrew the second brigade to the position occupied by the first, but scarcely had he done so when he learned that at an early hour in the forenoon the enemy’s infantry had appeared in his rear at Parker’s Store and cut off his communication with General Meade.  Surprised at this, he determined to withdraw to Todd’s Tavern, but before his resolution could be put into execution the Confederates attacked him with a heavy force, and at the same time began pushing troops down the Catharpen road.  Wilson was now in a perplexing situation, sandwiched between the Confederates who had cut him off in the rear at Parker’s store and those occupying the Catharpen road, but he extricated his command by passing it around the latter force, and reached Todd’s Tavern by crossing the Po River at Corbin’s bridge.  General Meade discovering that the enemy had interposed at Parker’s store between Wilson and the Fifth Corps, sent me word to go to Wilson’s relief, and this was the first intimation I received that Wilson had been pushed out so far, but, surmising that he would retire in the direction of Todd’s Tavern I immediately despatched Gregg’s division there to his relief.  Just beyond Todd’s Tavern Gregg met Wilson, who was now being followed by the enemy’s cavalry.  The pursuing force was soon checked, and then driven back to Shady Grove Church, while Wilson’s troops fell in behind Gregg’s line, somewhat the worse for their morning’s adventure.

When the Army of the Potomac commenced crossing the Rapidan on the 4th, General J. E. B. Stuart, commanding the Confederate cavalry, began concentrating his command on the right of Lee’s infantry, bringing it from Hamilton’s crossing and other points where it had been wintering.  Stuart’s force at this date was a little more than eight thousand men, organized in two divisions, commanded by Generals Wade Hampton and Fitzhugh Lee.  Hampton’s division was composed of three brigades, commanded by Generals Cordon, Young, and Rosser; Fitzhugh Lee’s division comprised three brigades also, Generals W. H. F. Lee, Lomax, and Wickham commanding them.

Information of this concentration, and of the additional fact that the enemy’s cavalry about Hamilton’s crossing was all being drawn in, reached me on the 5th, which obviated all necessity for my moving on that point as I intended at the onset of the campaign.  The responsibility for the safety of our trains and of the left flank of the army still continued, however, so I made such dispositions of my troops as to secure these objects by holding the line of the Brock road beyond the Furnaces, and thence around to Todd’s Tavern and Piney Branch Church.  On the 6th, through some false information, General Meade became alarmed about his left flank, and sent me the following note: 

“HEADQUARTERS ARMY OF THE POTOMAC,
“May 6, 1864.—­1 o’clock P. M. 
“MAJOR-GENERAL SHERIDAN,
“Commanding Cavalry Corps