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 di