He returned to his regiment after their defeat at the Battle of Chickamauga, and met them at Chattanooga, Tennessee, where the union forces under William Rosecrans were effectively surrounded. After weeks of starvation, Union reinforcements began to arrive in the vicinity. Three divisions led by Joseph Hooker managed to open a supply line to the stranded army with the Battle of Wauhatchie. The 18th U.S. Regiment was then in support of Hooker at the Battle of Lookout Mountain. The day after the Battle of Missionary Ridge, Knight, whose medical conditions were well known, was ordered to proceed to Detroit for duty as assistant to the provost marshal general of Michigan. During this time, he was also appointed Colonel of the 1st Delaware Cavalry by Governor William Cannon, but was never able to take up this duty.