With Johnston in our rear with an unknown number of men, we must take basic precautions to prevent being surprised. I issued the following orders,
HEADQUARTERS DEPARTMENT OF THE TENNESSEE
In rear of Vicksburg, MISS., May 28, 1863.
Commanding Fourth DIVISION, SIXTEENTH Army Corps:
GENERAL: You will immediately place your DIVISION in camp on the Hall’s Ferry road, on the south side of the creek, near the large hospital, its left resting on the road, and right extending toward McClernand’s left.
Strong grand guards, advanced posts, and pickets will be thrown out on the various approaches to Vicksburg leading from your front and between it and the Mississippi, and every precaution be taken to prevent surprise form front or rear, or the enemy from communicating in any manner upon these roads.
Every means will be resorted to in order to harass the rebels. You will also, without delay, open a good road over the nearest practicable route to McClernand’s left.
U. S. GRANT,
HDQRS. DEPT. OF THE TENNESSEE, Numbers 143.
In Field, near Vicksburg, MISS., May 28, 1863.
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IV. Army corps commanders and commanders of detached forces before Vicksburg will picket all roads, respectively, in rear of their respective positions, by which their camps or the city of Vicksburg can be approached, and prohibit all persons coming into or going out of our lines without special authority form the corps or commanders of detached forces whose pickets they desire to pass or the authority of the general commanding. The pickets will be placed sufficiently far out as to prevent surprise from any raid the enemy may attempt to make, and each commander will notify the others of the position of his pickets.
V. All that portion of the State of Louisiana now in the occupancy of the Army of the Tennessee will constitute the District of Northeastern Louisiana, and be commanded by Brigadier General J. C. Sullivan. During the absence of Brigadier General J. P. Hawkins, all troops of African descent in the District of Northeastern Louisiana will be under the immediate command of Colonel Isaac F. Shepard.
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By order of Major General U. S. Grant:
[JNO. A. RAWLINS.]
The Papers of Ulysses S Grant, Vol 8, p 282
O.R., I, xxiv, part 3, p 356-7