I wrote Gen. Sherman,
NEAR Vicksburg, MISS., June 22, 1863.
Major General WILLIAM T. SHERMAN, Comdg. Fifteenth Army Corps:
Information just received indicates that the enemy are crossing Big Black River, and intend marching against us by way of Bear Creek. They probably will start out to-morrow. I have ordered Parke to move out with four brigades to support his cavalry and hold the enemy as near Big Black River as possible until their position is clearly defined, when we can draw all our forces from Snyder’s Bluff and the forces previously indicated here to their support. Tuttle’s DIVISION should be marched out within supporting distance of Parke at once. You will go and command the entire force. Your wagon train can move from wherever you may be to Lake’s Landing or Snyder’s Bluff, whichever may be the most convenient for supplies and ordnance stores. When on the ground you can draw troops from Snyder’s Bluff and the three brigades designated from McPherson’s corps directly, without communicating through headquarters. Should any [further] forces become necessary, I can take them from our left by leaving that in the same condition it was before the arrival of Lauman and Herron.
U. S. GRANT.
The Papers of Ulysses S Grant, Vol 8, p 408
O.R., I, xxiv, part 3, p 428