Emilio describes ( [BBR], pp.51-55) the lead-up to the 54th’s first major action:

Heavy cannonading was heard in the direction of Morris Island, at 5 A. M. on the 10th. Before night word came that all the ground south of Fort Wagner on Morris Island was captured with many guns and prisoners. This news was received with rousing cheers by Terry’s men and the sailors. At dawn Colonel Davis’s men crossed to James Island, his skirmishers driving a few cavalry. At an old house the main force halted with pickets advanced. While this movement was taking place, a portion of the other troops landed. That day a mail brought news of Vicksburg’s capture and Lee’s defeat at Gettysburg. Lieut. Edward B. Emerson joined the Fifty-fourth from the North.

About noon of the 11th, the regiment landed, marched about a mile, and camped in open ground on the furrows of an old field. The woods near by furnished material for brush shelters as a protection against the July sun. By that night all troops were ashore. Terry’s division consisted of three brigades, —Davis’s, of the Fifty-second and One Hundred and Fourth Pennsylvania and Fifty-sixth New York; Brig.-Gen. Thomas G. Stevenson’s, of the Twenty-fourth Massachusetts, Tenth Connecticut, and Ninety-seventh Pennsylvania; and Montgomery’s, of the Fifty-fourth Massachusetts and Second South Carolina.

James Island is separated from the mainland by Wappoo Creek. From the landing a road led onward, which soon separated into two: one running to the right through timber, across low sandy ground to Secessionville; the other to the left, over open fields across the low ground, past Dr. Thomas Grimball’s house on to the Wappoo. The low ground crossed by both these roads over causeways formed the front of Terry’s lines, and was commanded by our naval vessels. Fort Pemberton, on the Stono, constituted the enemy’s right. Thence the line was retired partially behind James Island Creek, consisting of detached light works for field-guns and infantry. Their left was the fortified camp of Secessionville, where, before Battery Lamar, General Benham was repulsed in the spring of 1862.

General Beauregard, the Confederate Department commander, considered an attack on Charleston by way of James Island as the most dangerous to its safety. He posted his forces accordingly, and on July 10 had 2,926 effectives there, with 927 on Morris Island, 1,158 on Sullivan’s Island, and 850 in the city. Few troops from other points were spared when Morris Island was attacked on the 10th; therefore Terry’s diversion had been effective. Had Beauregard’s weakness been known, Terry’s demonstration in superior force might have been converted into a real attack, and James Island fallen before it, when Charleston must have surrendered or been destroyed.

Captain Willard, on the 11th, with Company B, was sent to John’s Island at Legareville to prevent a repetition of firing upon our vessels by artillery such as had occurred that morning.

In the afternoon the Tenth Connecticut and Ninety-seventh Pennsylvania, covered by the “Pawnee’s” fire, advanced the picket line. Word was received of an unsuccessful assault on Fort Wagner, with considerable loss to us. Abraham F. Brown of Company E accidentally shot himself to death with a small pistol he was cleaning. Late that afternoon Lieutenant-Colonel Hallowell, with Companies D, F, I, and K, went out on picket in front of our right, remaining throughout a dark and stormy night. During the night of the 13th, Captain Emilio, with Company E, picketed about Legareville. Capt. A. P. Rockwell’s First Connecticut Battery arrived from Beaufort on the 14th.