I had been engaged for some days previous at the headquarters of the Third Division of the Ninth Army Corps, General Potter commanding, as judge advocate in connection with a court-martial. On the evening before the battle, the evening of the 29th, an order came to me to report to my regiment. I did so, and found that it was about to take its place in line of battle, ready to join in the charge on the morning of the next day. I had my supper in camp as usual, and we started to take up our position, carrying with us no food, nor anything in the way of clothing, except the clothes we had on. The time arrived when the explosion was expected to take place, but no explosion occurred. It was learned that the fuse had gone out. An officer of the Forty-eighth Pennsylvania volunteered to go in and relight the fuse; and, as I remember, it went out a second time, and was relighted. Shortly before five o'clock, just as the sun was rising, a sound as of thunder was distinctly heard, and in a moment the earth at the point where the mine had been constructed was thrown upward, slowly mounting into the air to a height of some two hundred feet, and then, spreading out like a fan, fell back again into the excavation made by the explosion. The soil was of a clayey character, and enormous boulders of clay were thrown up and fell back around the opening, resembling in some respects the crater of a volcano; hence the battle has sometimes been called the Battle of the Crater. The men who were in this fort, and the artillery, and everything pertaining to the fortifications, huge timbers, ammunition, tents, and everything that would be naturally located there, were all thrown heavenward. The men, of course, were either killed or wounded, with hardly an exception. A large number of men were in the fort. It has been estimated by some that there were a thousand. As soon as the explosion took place, the artillery all along the line on our side, some one hundred and twenty pieces or more, began firing at that point. The firing lasted some moments, and then the troops were directed to charge. It had been the plan of General Burnside to have his division of colored troops lead the advance. There was in the Ninth Corps at that time a division of colored troops. They had been drilled with the idea of taking the advance, but General Meade overruled Burnside's plan, and thought it best that the colored troops should not be put in that position. So General Burnside called together his division commanders, and told them of the change of plan on the very night before the battle, and allowed them to draw lots to see which one should take the lead. The lot fell to General Ledlie, the least efficient of the division commanders in the Ninth Corps.