I wrote Gen. Halleck,
NEAR Vicksburg, MISS., June 26, 1863.
H. W. HALLECK,
Yesterday a mine was sprung under the enemy’s most commanding fort, producing a crater sufficient to hold two regiments of infantry. Our men took immediate possession, and still hold it. The fight for it has been incessant, and thus far we have not been able to establish batteries in the breach. Expect to succeed. Joe Johnston has removed east of the Big Black. His movements are mysterious, and may be intended to cover a movement from his rear into East or WEST Tennessee, or upon Banks. I have General Sherman out near his front on the Big Black with a large force watching him. I will use every effort to learn any move Johnston may make, and send troops from here to counteract any change he may make, if I can.
U. S. GRANT,
The Papers of Ulysses S Grant, Vol 8, p 431-2
O.R., I, xxiv, part 1, p 43