I concluded, then, a few days later, to do something in the way of offensive movement myself, having in view something of the same object that Lee had had. Wright's and Emory's corps were in Washington, and with this reduction of my force Lee might very readily have spared some troops from the defences to send West. I had other objects in view, however, besides keeping Lee where he was. The mine was constructed and ready to be exploded, and I wanted to take that occasion to carry Petersburg if I could. It was the object, therefore, to get as many of Lee's troops away from the south side of the James River as possible. Accordingly, on the 26th, we commenced a movement with Hancock's corps and Sheridan's cavalry to the north side by the way of Deep Bottom, where Butler had a pontoon bridge laid.
The plan, in the main, was to let the cavalry cut loose and, joining with Kautz's cavalry of the Army of the James, get by Lee's lines and destroy as much as they could of the Virginia Central Railroad, while, in the mean time, the infantry was to move out so as to protect their rear and cover their retreat back when they should have got through with their work. We were successful in drawing the enemy's troops to the north side of the James as I expected. The mine was ordered to be charged, and the morning of the 30th of July was the time fixed for its explosion. I gave Meade minute orders (*38) on the 24th directing how I wanted the assault conducted, which orders he amplified into general instructions for the guidance of the troops that were to be engaged.
Meade's instructions, which I, of course, approved most heartily, were all that I can see now was necessary. The only further precaution which he could have taken, and which he could not foresee, would have been to have different men to execute them.
The gallery to the mine was over five hundred feet long from where it entered the ground to the point where it was under the enemy's works, and with a cross gallery of something over eighty feet running under their lines. Eight chambers had been left, requiring a ton of powder each to charge them. All was ready by the time I had prescribed; and on the 29th Hancock and Sheridan were brought back near the James River with their troops. Under cover of night they started to recross the bridge at Deep Bottom, and to march directly for that part of our lines in front of the mine.
Warren was to hold his line of intrenchments with a sufficient number of men and concentrate the balance on the right next to Burnside's corps, while Ord, now commanding the 18th corps, temporarily under Meade, was to form in the rear of Burnside to support him when he went in. All were to clear off the parapets and the _abatis_ in their front so as to leave the space as open as possible, and be able to charge the moment the mine had been sprung and Burnside had taken possession. Burnside's corps was not to stop in the crater at all but push on to the top of the hill, supported on the right and left by Ord's and Warren's corps.
Warren and Ord fulfilled their instructions perfectly so far as making ready was concerned. Burnside seemed to have paid no attention whatever to the instructions, and left all the obstruction in his own front for his troops to get over in the best way they could. The four divisions of his corps were commanded by Generals Potter, Willcox, Ledlie and Ferrero. The last was a colored division; and Burnside selected it to make the assault. Meade interfered with this. Burnside then took Ledlie's division--a worse selection than the first could have been. In fact, Potter and Willcox were the only division commanders Burnside had who were equal to the occasion. Ledlie besides being otherwise inefficient, proved also to possess disqualification less common among soldiers.
There was some delay about the explosion of the mine so that it did not go off until about five o'clock in the morning. When it did explode it was very successful, making a crater twenty feet deep and something like a hundred feet in length. Instantly one hundred and ten cannon and fifty mortars, which had been placed in the most commanding positions covering the ground to the right and left of where the troops were to enter the enemy's lines, commenced playing. Ledlie's division marched into the crater immediately on the explosion, but most of the men stopped there in the absence of any one to give directions; their commander having found some safe retreat to get into before they started. There was some delay on the left and right in advancing, but some of the troops did get in and turn to the right and left, carrying the rifle-pits as I expected they would do.
There had been great consternation in Petersburg, as we were well aware, about a rumored mine that we were going to explode. They knew we were mining, and they had failed to cut our mine off by countermining, though Beauregard had taken the precaution to run up a line of intrenchments to the rear of that part of their line fronting where they could see that our men were at work. We had learned through deserters who had come in that the people had very wild rumors about what was going on on our side. They said that we had undermined the whole of Petersburg; that they were resting upon a slumbering volcano and did not know at what moment they might expect an eruption. I somewhat based my calculations upon this state of feeling, and expected that when the mine was exploded the troops to the right and left would flee in all directions, and that our troops, if they moved promptly, could get in and strengthen themselves before the enemy had come to a realization of the true situation. It was just as I expected it would be. We could see the men running without any apparent object except to get away.
It was half an hour before musketry firing, to amount to anything, was opened upon our men in the crater. It was an hour before the enemy got artillery up to play upon them; and it was nine o'clock before Lee got up reinforcements from his right to join in expelling our troops.