 The flanking attack on the latter has been attributed by historians to the Confederates moving to the sound of the guns, though Samuel Lockett on Bragg's staff recalled that Bragg dispatched him and Franklin Gardner to order the attack.After the Hornet's Nest fell, the remnants of the Union line established a solid three-mile (5 km) front around Pittsburg Landing, extending west from the river and then north, up the River Road, keeping the approach open for the expected, although belated, arrival of Lew Wallace's division.Sherman commanded the right of the line, McClernand took the center, and on the left, the remnants of W. H. L. Wallace's, Hurlbut's, and Stuart's men mixed with thousands of stragglers who were crowding on the bluff over the landing.