McLaw's division was in Greenwood on July 1, with orders from Lee to march east over South Mountain to Gettysburg, about 17 miles distant. The men, however, were prevented from using the only road over the mountain by Ewell's trains--reckoned by McLaws to be 14 miles long--which clogged the road for ten hours, until 4:00 P.M.. Falling in behind the trains, McLaws marched until midnight. His men camped at Marsh Creek, about 3_ miles west of Gettysburg.
On the morning of July 2, McLaws rode up to Lee's headquarters and got personal instructions from Lee on how to place his division for the day's attack. Lee wanted McLaws to place his division perpendicular to the Emmitsburg Road at the Peach Orchard and go northward toward the town, rolling up the Union left flank; the day's march was meant to produce another Chancellorsville. McLaws went back to his men, who had moved forward that morning along the Chambersburg Pike, marched them back to Herr Ridge and waited for Longstreet to give the signal for the trek to their destination.
Longstreet was in a peevish mood and stalled the march until noon. When the two-division-long column finally got moving to the south, it soon came to a stretch of road visible to enemy scouts on Little Round Top. To achieve surprise, the column would have to start over and find a hidden approach. McLaws still wanted to lead the march, however, so rather than everybody turning around and Hood's division leading, McLaws's van marched back along the entire column to the Chambersburg Pike, wasting valuable time. McLaws finally finished his troubled march around 3:30 P.M., reaching the woods along Seminary Ridge opposite the Peach Orchard only to find Yankee infantry and artillery already bristling from the peach trees. When McLaws had a closer look he was shocked to find that the Federal line extended past his front to the right, toward Little Round Top. News of the whereabouts of the Union left flank had obviously been faulty. His assault as planned by Lee would meet head-on opposition.
McLaws and Longstreet were by now both muttering oaths and barking orders. McLaws deployed his division on a two-brigade front, with Kershaw on the right and Barksdale on the left. Semmes was put in a second line behind Kershaw, and Wofford behind Barksdale. Under a hastily improvised plan, McLaws would now have to wait for Hood, deploying on his right, to attack first. About 4:30 P.M. the artillery opened up and Hood's brigades plunged forward toward Little Round Top and Devil's Den. Longstreet stayed with McLaws, and by now he was at his most overbearing. There was not much for McLaws to do except to move among his men, steadying them and telling them to be patient. This arrangement, which produced a lasting bitter resentment in McLaws, was no doubt the result of Longstreet's secret promise to Lee before the battle that he would supervise McLaws closely.
Finally, around 5:30 P.M., Longstreet gave the signal and Kershaw's brigade moved out, then Semmes's behind him. Barksdale's and Wofford's brigades got tangled up in the batteries dotting the Confederate line and were delayed, but soon they too were away, and in a matter of minutes had stormed through Union lines in the Peach Orchard and beyond. As they poured forward, they outflanked the Union brigades in the Wheatfield fighting Kershaw and Semmes and sent them back in a rout. McLaws waited behind with Longstreet while his four brigades stormed eastward.
When McLaws's brigades had gone as far as they could go in the dying light of July 2, Longstreet, who was evidently keeping a firm hand on McLaws's command, ordered them back before they were annihilated by the Union reserves which continued to arrive in front of them. The men of the division pulled back to safe positions from Devil's Den to the Peach Orchard for the night. McLaws's division had fought with deadly ferocity. Between them, Hood's and McLaws's divisions inflicted about 9,000 casualties on the Yankees of the Third, Second, and Fifth Corps. McLaws's casualties for the day were about 2,200, 30% of his force. The disparity in the losses is extraordinary, especially considering that McLaws and Hood were the attackers.
On July 3 McLaws's Division, as well as Hood's, were pulled back to the west side of Emmitsburg Road after the failure of Pickett's Charge.
McLaws did not write a report after the battle of Gettysburg. He later wrote that the attack was "unnecessary and the whole plan of battle a bad one." Longstreet, for his part, failed to commend McLaws in his report after the battle. McLaws never again served with the Army of Northern Virginia. Going west with Longstreet's Corp in the autumn, he was brought up on charges of lack of cooperation and negligence by Longstreet after the disappointing Knoxville Campaign. A court found McLaws guilty of some of the charges, but the next May, Jefferson Davis ordered that he be allowed back in the army. Lee declined to accept him, however, and assigned McLaws to South Carolina, where he spent the rest of the war.
For further reading:
McLaws, Lafayette. "Gettysburg." Southern Historical Society Papers 7, 1879. Reprint, Wilmington, 1990
_____, Papers, Southern Historical Collection, University of North Carolina, Chapel Hill; Duke University, Durham, NC