which the remainder of the army soon passed
and pushed out for a mile or two to watch and detain any advance that
might be made from the other side. Warren followed the cavalry, and by
the morning of the 13th had his whole corps over. Hancock followed
Warren. Burnside took the road to Jones's Bridge, followed by Wright.
Ferrero's division, with the wagon train, moved farther east, by Window
Shades and Cole's Ferry, our rear being covered by cavalry.

It was known that the enemy had some gunboats at Richmond. These might
run down at night and inflict great damage upon us before they could be
sunk or captured by our navy. General Butler had, in advance, loaded
some vessels with stone ready to be sunk so as to obstruct the channel
in an emergency. On the 13th I sent orders to have these sunk as high
up the river as we could guard them, and prevent their removal by the
enemy.

As soon as Warren's corps was over the Chickahominy it marched out and
joined the cavalry in holding the roads from Richmond while the army
passed. No attempt was made by the enemy to impede our march, however,
but Warren and Wilson reported the enemy strongly fortified in their
front. By the evening of the 13th Hancock's corps was at Charles City
Court House on the James River. Burnside's and Wright's corps were on
the Chickahominy, and crossed during the night, Warren's corps and the
cavalry still covering the army. The material for a pontoon bridge was
already at hand and the work of laying it was commenced immediately,
under the superintendence of Brigadier-General Benham, commanding the
engineer brigade. On the evening of the 14th the crossing commenced,
Hancock in advance, using both the bridge and boats.

When the Wilderness campaign commenced the Army of the Potomac,
including Burnside's--which was a separate command until the 24th of May
when it was incorporated with the main army--numbered about 116,000 men.
During the progress of the campaign about 40,000 reinforcements were
received. At the crossing of the James River June 14th-15th the army
numbered about 115,000. Besides the ordinary losses incident to a
campaign of six weeks' nearly constant fighting or skirmishing, about
one-half of the artillery was sent back to Washington, and many men were
discharged by reason of the expiration of their term of service.* In
estimating our strength every enlisted man and every commissioned
officer present is included, no matter how empl