Wilson with the second brigade encountered Rosser's brigade of cavalry just beyond the Meeting House, and drove it back rapidly a distance of about two miles, holding it there till noon, while his first brigade was halted on the north side of Robinson's Run near the junction of the Catharpen and Parker's Store roads.
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.