On November 25, 1863, the New York infantry regiments of Ireland's Third Brigade, Geary's Second Division, Slocum's Twelfth Corps, in Hooker's command of the 11th and 12th Corps, Army of the Potomac, supported Landgraeber's Battery on the west side of Missionary Ridge in the afternoon, advanced and connected with the right of Palmer's 14th Corps, and assisted in breaking the lines of Breckinridge's Confederate Corps, with the division capturing many prisoners. The brigade's skirmishers reached this point and beyond, while its main body bivouacked at the foot of the hill in the Confederate camps.