Hello, Kas01!
At Chickamauga, General Gracie's infantry brigade was composed of the 43rd Alabama, 63rd Tennessee, and the 1st, 2nd, 3rd, and 4th Battalions of Hilliard's Alabama Legion. His brigade was part of Brigadier General William Preston's division of Major General Simon Bolivar Buckner's Corps.
Gracie's Brigade was heavily engaged in this bloody, chaotic battle in the northwest Georgia woods, where it was involved in the assaults on Major General George Thomas' wing of the Union Army of the Cumberland (specifically troops from Negley's and Brannan's divisions), which staunchly defended Snodgrass Hill on Sept. 20,1863. Gracie's boys captured a spur in front of the Union position and managed to hold on for about an hour before they were finally repulsed by a counterattack by Stanley's brigade. Gracie's casualties here were 725 out of the 2,003 men in his brigade--all in the space of about an hour and a half!