d become a unit.

"All the minor details of your advance are left entirely to your
direction. If, however, you think it practicable to use your cavalry
south of you, so as to cut the railroad about Hicksford, about the time
of the general advance, it would be of immense advantage.

"You will please forward for my information, at the earliest practicable
day, all orders, details, and instructions you may give for the
execution of this order.

"U. S. GRANT, Lieutenant-General.
"MAJOR-GENERAL B. F. BUTLER."

On the 16th these instructions were substantially reiterated. On the
19th, in order to secure full co-operation between his army and that of
General Meade, he was informed that I expected him to move from Fort
Monroe the same day that General Meade moved from Culpeper. The exact
time I was to telegraph him as soon as it was fixed, and that it would
not be earlier than the 27th of April; that it was my intention to fight
Lee between Culpeper and Richmond, if he would stand. Should he,
however, fall back into Richmond, I would follow up and make a junction
with his (General Butler's) army on the James River; that, could I be
certain he would be able to invest Richmond on the south side, so as to
have his left resting on the James, above the city, I would form the
junction there; that circumstances might make this course advisable
anyhow; that he should use every exertion to secure footing as far up
the south side of the river as he could, and as soon as possible after
the receipt of orders to move; that if he could not carry the city, he
should at least detain as large a force there as possible.

In co-operation with the main movements against Lee and Johnston, I was
desirous of using all other troops necessarily kept in departments
remote from the fields of immediate operations, and also those kept in
the background for the protection of our extended lines between the
loyal States and the armies operating against them.

A very considerable force, under command of Major-General Sigel, was so
held for the protection of West Virginia, and the frontiers of Maryland
and Pennsylvania. Whilst these troops could not be withdrawn to distant
fields without exposing the North to invasion by comparatively small
bodies of the enemy, they could act directly to their front, and give
better protection than if lying idle in garrison. By such a movement
they would either compel the enemy to detach largely for the protection