CHANCELLORSVILLE, VA., May 2, 1863, 9.30 A.M.

MAJOR-GEN. SLOCUM AND MAJOR-GEN. HOWARD.

I am directed by the major-general commanding to say that the
disposition you have made of your corps has been with a view to a front
attack by the enemy. If he should throw himself upon your flank, he
wishes you to examine the ground, and determine upon the positions you
will take in that event, in order that you may be prepared for him in
whatever direction he advances. He suggests that you have heavy reserves
well in hand to meet this contingency. The right of your line does not
appear to be strong enough. No artificial defences worth naming have
been thrown up; and there appears to be a scarcity of troops at that
point, and not, in the general's opinion, as favorably posted as might
be.

We have good reason to suppose that the enemy is moving to our right.
Please advance your pickets for purposes of observation as far as may
be, in order to obtain timely information of their approach.

JAMES H. VAN ALEN,
Brigadier-General and Aide-de-Camp.

Although addressed to Slocum as well as Howard, this order scarcely
applied with much force to the former, who occupied the right centre of
the army, with Birney lying between him and the Eleventh Corps. Howard
carried out his part of these instructions as well as circumstances
allowed. He posted Barlow's brigade, his largest and best, on the
Buschbeck line, in position for a general reserve for the corps, and
took advantage of the ground in a manner calculated to strengthen his
flank, and to enable it to cover a change of front if necessary; he
placed his reserve artillery on the right of the rifle-pits running
across the road at Dowdall's; he located several regiments on Dowdall's
clearing so as to wheel to the west or south as might be required;
Major Hoffman was set to work, and spent the entire day locating and
supervising the construction of field-works; and generally, Howard
disposed the forces under his command after a fashion calculated to
oppose a stubborn resistance to attacks down the pike, should they be
made.

Later on in the day, we have seen how Hooker's aide, Capt. Moore,
ordered this brigade of Barlow's away from its all-important position.
We have seen Hooker's dispositions of the Third and Twelfth Corps. We
have seen Hooker's 4.10 P.M. order to Sedgwick. No room is left to doubt
that Hooker's opini