[Illustration: _Confederate Battery 5, shown here under Federal occupation 6 days after its capture, was one of the first points on Petersburg’s outer defense lines to fall to the XVIII Corps during the June 15 attack._] The third day of battle was practically a repetition of that of the preceding day. Again the Northern forces attacked the Confederate troops, concentrating their efforts to the south of the positions captured earlier. Again the Confederates were forced to draw back. A decisive breakthrough of the opposing line was now anticipated by the assaulting forces. About 12:30 a.m., June 18, Beauregard ordered his troops to begin a withdrawal to new positions about a mile closer to the city. Throughout the early morning hours of that day Beauregard had his men busily engaged in the construction of this defense line. Colonel Roman later recalled that “without a moment’s rest the digging of the trenches was begun, with such utensils as had been hastily collected at Petersburg, many of the men using their bayonets, their knives, and even their tin cans, to assist in the rapid execution of the work.” [Illustration: _A section of the Confederate defense lines around Petersburg. Note the use of wickerware (gabions), sharpened stakes (fraises), and branches (abatis) to protect the position._] A general assault by the Union forces was ordered for 4 a.m. on June 18. When the attack began it was soon discovered that the ranks of the enemy had not been broken nor had the city fallen into Northern hands. The area where the left flank of the Dimmock Line anchored on the Appomattox was empty, except for a thin line of skirmishers who were gradually forced back. The Northern troops came on, crossing the Norfolk and Petersburg Railroad west of where the defenders had constructed their new line and continuing on until they were brought face to face with the muzzles of Confederate guns. Meanwhile, elements of Lee’s command continued pouring in to aid their comrades, and Lee came down from his temporary headquarters near Chester, Va., to personally direct the defense operations. Throughout that June Saturday, brisk action occurred on the new Petersburg front. The major Union drive, involving elements of five corps, came about 4 p.m. Artillery hammered the Confederates. Infantry charged, only to be hurled back. During the course of one of these futile drives, the 1st Maine Heavy Artillery reportedly suffered the most severe losses of any regiment in a single engagement of the entire war. This unit, 850 strong, charged from the concealment of the Prince George Court House Road north of where Fort Stedman was soon to stand. Met by a heavy crossfire, it withdrew in less than one-half hour, with 632 casualties.