JOHNSTON'S MOVEMENTS--FORTIFICATIONS AT HAINES' BLUFF--EXPLOSION OF THE MINE--EXPLOSION OF THE SECOND MINE-- PREPARING FOR THE ASSAULT--THE FLAG OF TRUCE--MEETING WITH PEMBERTON--NEGOTIATIONS FOR SURRENDER--ACCEPTING THE TERMS--SURRENDER OF VICKSBURG.
On the 22d of June positive information was received that Johnston had crossed the Big Black River for the purpose of attacking our rear, to raise the siege and release Pemberton.
The correspondence between Johnston and Pemberton shows that all expectation of holding Vicksburg had by this time passed from Johnston's mind. I immediately ordered Sherman to the command of all the forces from Haines' Bluff to the Big Black River.
This amounted now to quite half the troops about Vicksburg.
Besides these, Herron and A. J. Smith's divisions were ordered to hold themselves in readiness to reinforce Sherman. Haines' Bluff had been strongly fortified on the land side, and on all commanding points from there to the Big Black at the railroad crossing batteries had been constructed. The work of connecting by rifle-pits where this was not already done, was an easy task for the troops that were to defend them.
We were now looking west, besieging Pemberton, while we were also looking east to defend ourselves against an expected siege by Johnston. But as against the garrison of Vicksburg we were as substantially protected as they were against us. Where we were looking east and north we were strongly fortified, and on the defensive. Johnston evidently took in the situation and wisely, I think, abstained from making an assault on us because it would simply have inflicted loss on both sides without accomplishing any result. We were strong enough to have taken the offensive against him; but I did not feel disposed to take any risk of losing our hold upon Pemberton's army, while I would have rejoiced at the opportunity of defending ourselves against an attack by Johnston.
From the 23d of May the work of fortifying and pushing forward our position nearer to the enemy had been steadily progressing. At three points on the Jackson road, in front of Leggett's brigade, a sap was run up to the enemy's parapet, and by the 25th of June we had it undermined and the mine charged.
The enemy had countermined, but did not succeed in reaching our mine. At this particular point the hill on which the rebel work stands rises abruptly. Our sap ran close up to the outside of the enemy's parapet. In fact this parapet was also our protection. The soldiers of the two sides occasionally conversed pleasantly across this barrier; sometimes they exchanged the hard bread of the Union soldiers for the tobacco of the Confederates; at other times the enemy threw over hand-grenades, and often our men, catching them in their hands, returned them.
Our mine had been started some distance back down the hill; consequently when it had extended as far as the parapet it was many feet below it. This caused the failure of the enemy in his search to find and destroy it. On the 25th of June at three o'clock, all being ready, the mine was exploded. A heavy artillery fire all along the line had been ordered to open with the explosion. The effect was to blow the top of the hill off and make a crater where it stood. The breach was not sufficient to enable us to pass a column of attack through. In fact, the enemy having failed to reach our mine had thrown up a line farther back, where most of the men guarding that point were placed. There were a few men, however, left at the advance line, and others working in the countermine, which was still being pushed to find ours. All that were there were thrown into the air, some of them coming down on our side, still alive. I remember one colored man, who had been under ground at work when the explosion took place, who was thrown to our side. He was not much hurt, but terribly frightened. Some one asked him how high he had gone up. "Dun no, massa, but t'ink 'bout t'ree mile," was his reply. General Logan commanded at this point and took this colored man to his quarters, where he did service to the end of the siege.
As soon as the explosion took place the crater was seized by two regiments of our troops who were near by, under cover, where they had been placed for the express purpose. The enemy made a desperate effort to expel them, but failed, and soon retired behind the new line. From here, however, they threw hand-grenades, which did some execution. The compliment was returned by our men, but not with so much effect. The enemy could lay their grenades on the parapet, which alone divided the contestants, and roll them down upon us; while from our side they had to be thrown over the parapet, which was at considerable elevation. During the night we made efforts to secure our position in the crater against the missiles of the enemy, so as to run trenches along the outer base of their parapet, right and left; but the enemy continued throwing their grenades, and brought boxes of field ammunition (shells), the fuses of which they would light with portfires, and throw them by hand into our ranks. We found it impossible to continue this work. Another mine was consequently started which was exploded on the 1st of July, destroying an entire rebel redan, killing and wounding a considerable number of its occupants and leaving an immense chasm where it stood. No attempt to charge was made this time, the experience of the 25th admonishing us. Our loss in the first affair was about thirty killed and wounded. The enemy must have lost more in the two explosions than we did in the first. We lost none in the second.
From this time forward the work of mining and pushing our position nearer to the enemy was prosecuted with vigor, and I determined to explode no more mines until we were ready to explode a number at different points and assault immediately after. We were up now at three different points, one in front of each corps, to where only the parapet of the enemy divided us.