Campaign for Petersburg

by Richard Wayne Lykes

The next step in the Union plan was to burrow out into lateral galleries at the end of the long shaft. Accordingly, on July 18, work was begun on these branches which extended to the right and left, paralleling the Confederate fortifications above. When completed, these added another 75 feet to the total length of the tunnel which now reached 586 feet into the earth. It was about 20 feet from the floor of the tunnel to the enemy works above. The average internal dimensions of the shaft were 5 feet high, with a base 4½ feet wide tapering to 2 feet at the top.

Digging was finally completed on July 23. Four days later the task of charging the mine with black powder was accomplished. Three hundred and twenty kegs of powder weighing about 25 pounds each were arranged in the two lateral galleries in eight magazines. The total charge was 8,000 pounds. The powder was sandbagged to direct the force of the explosion upward and the fuses were spliced together to form a 98-foot line.

Meanwhile, preparations for the large-scale attack which was to follow the explosion of the mine had been carried out. Burnside wanted his IX Corps to lead the attack, spearheaded by a fresh, 4,300-man Negro division, and pressed his wishes on Meade. Both Meade and Grant approved the request, but refused to allow the black troops to lead the assault for fear that, if the attack failed, the Union commanders could be accused of wanting to get rid of the only Negro troops then with the Army of the Potomac. Burnside did not learn of this decision until the day before the assault, July 29, and he was forced to change his plans at the last moment. Three white divisions would make the initial charge, with the black division in reserve. Burnside had the commanding generals of these three divisions draw straws to see which would lead. Brig. Gen. James F. Ledlie of the 1st Division won the draw.

Despite these 11th-hour changes, a plan of battle had been evolved. During the night of July 29-30, the bulk of the IX Corps was assembled in the ravine behind the mine entrance and in the two approach trenches leading to the picket line. Troops from other Union corps were marshalled as reinforcements. Artillerymen, manning 110 guns and 54 mortars, were alerted to begin shelling the Confederate line. To assist the attack, Grant sent a cavalry and infantry force north of the James to threaten the Richmond defenses and destroy whatever they could of the Virginia Central Railroad. The object was to draw as many of Lee’s soldiers away from Petersburg as possible. And it worked. When the assault came, only 18,000 Confederates were left to guard the city.

At 3:15 a.m., July 30, Pleasants lit the powder fuse and mounted the parapet to see the results of his regiment’s work. The explosion was expected at 3:30 a.m. Time passed slowly and the men, huddled behind the lines, grew more apprehensive. By 4:15 there could be no doubt that something had gone wrong. Two volunteers from the 48th Regiment (Lt. Jacob Douty and Sgt. Harry Reese) crawled into the tunnel and found that the fuse had burned out at a splice. They relighted it and scrambled to safety. Finally, at 4:40 a.m., the earth trembled, and with one great roar, men, equipment, and debris were hurled high into the air. At least 278 Confederate troops were killed or wounded in the tremendous blast, and two of the four guns in the battery were destroyed beyond repair. The crater torn by the powder was at least 170 feet long, 60 to 80 feet wide, and 30 feet deep.

The awesome spectacle of the mine explosion caused a delay in the Union charge following the explosion. Removal of obstructions between the lines caused further delay. Soon, however, an advance was made to the crater, where many of the attacking force paused to seek shelter on its steep slopes or to look at the havoc caused by the mine. The hard-pressed Confederates rallied quickly and soon were pouring shells and minié balls into their opponents. Union reinforcements poured into the breach; but, instead of going forward, they either joined their comrades in the crater or branched out to the immediate right and left along the lines. By 8:30 that morning a large part of the IX Corps had been poured into the captured enemy salient. More than 15,000 troops now milled in and about the crater.

By prompt action and determined effort the Confederates had prevented a breakthrough. The attention of three batteries was soon directed on the bluecoats at the crater. Artillery hammered with shot and shell the huddled groups of increasingly demoralized men. In addition, mortars brought to within 50 yards of the crater dropped shells on the soldiers with deadly effect.

Successful as these devices were in halting the Union advance, Lee was aware that an infantry charge would be necessary to dislodge the enemy. By 6 a.m. an order had gone out to Brig. Gen. William Mahone to move two brigades of his division from the lines south of Petersburg to the defense of the threatened position; Mahone had anticipated the order and already had his troops in motion. Then Lee joined Beauregard in observing the battle from the Gee house, 500 yards to the rear of the scene of action.

Colonel Pleasants’ sketch of the Crater.