Longstreet, with eight brigades, forced their way through, throwing the right and right center of the Union line back in confusion. Rosecrans, McCook and Crittenden left the field. A great many of the troops under the latter named two left the field. Some few of them later rallied and remained on the field during the afternoon. Gen. Thomas, then being the senior officer on the field, immediately assumed command. Holding a pivot with the extreme left of his line, the right end moved back until it reached Snodgrass hill. This gave him an almost impregnable position. With this newly formed east-west line he could check the advance of the Confederates and also cover Rosecrans’ retreat. The Confederates, upon crossing the road, changed front with their artillery. Their infantry swept around like a large gate on hinges. By almost continuous advancing, the Confederates reached the south side of Snodgrass hill where they established their line. Within less than an hour from the time of the break in the Union line, three other brigade commanders lost their lives. Near the Confederate right, Col. Peyton H. Colquitt, 46th Georgia Infantry, was mortally wounded about noon. Colquitt commanded Gist’s brigade of Walker’s division. Lt.-Col. Leroy Napier assumed command of Colquitt’s brigade. A short distance to the south, Brig.-Gen. James Deshler of Texas was killed about the same time. Deshler commanded a brigade in Cleburne’s division. His command was taken over by Col. Roger Q. Mills. Farther to the southwest in the Union line, Brig.-Gen. William H. Lytle, the Cincinnati soldier-poet, was killed while trying to rally his brigade against the Confederate sweep to the north. Lytle commanded the 1st brigade of Sheridan’s division. His command was taken over by Col. Silas Miller of the 36th Illinois Infantry. THE PEAK OF THE BATTLE