at Halltown. Here Wright was joined by Crook, who came from
Sharpsburg by way of Shepherdstown.

It was on the 30th of July that McCausland burned Chambersburg.
In the confusion caused by his rapid movements, Halleck imagined
that Early's whole force was in Pennsylvania. Therefore he ordered
Wright back into Maryland, first to Frederick and them to Emmettsburg,
to hold the passes of the South Mountain against the supposed
invader. About noon Wright faced about, taking Crook with him,
and recrossed the Potomac. Toward evening Crook and Wright covered
the passes, while Emory crossed the Catoctin and at one in the
morning of the 31st halted near Jefferson after a hard day's march
of thirteen miles, during which the men and animals of all the
corps suffered terribly from the heat and dust, added to the
accumulated fatigue they had already undergone from a succession
of long days and short nights. Reveille was sounded at five o'clock,
and at six the march was resumed. Emory passed through Frederick,
moved about two miles on the Emmettsburg road and went into bivouac,
having made thirteen miles during the day. The army was now
concentrated at Frederick, holding the line of the Monocacy and
observing the passes of the South Mountain. Fortunately for the
men and horses, Halleck now learned from Couch, who commanded in
Pennsylvania, with rather less than a handful of troops, the exact
dimensions of McCausland's raid. Accordingly Wright's troops were
allowed to rest where they were.

Grant ordered up a division of cavalry from the Army of the Potomac,
and on the 4th of August set out in person for Frederick, avoiding
Washington, to see for himself just what the situation was, and to
make better arrangements for the future. On the 5th of August he
joined Hunter on the Monocacy, and at once ordered him to take
Wright, Emory, and Crook across the Potomac, to find the enemy,
and to attack him.

Grover's division and the parts of Emory's that had been at Bermuda
Hundred embarked on the James on the 31st of July, and passed up
the Potomac to Washington, but too late to join Emory on the
Monocacy. Thus, before beginning the new movement, Emory had of
his own division 4,600 effective and eight regiments of Grover's,
numbering 2,750. These, being part of four brigades, were temporarily
organized into two, and as Grover himself had not yet joined, their
command was given to Molineux.

About this time, Battery L, 1st Ohi