Tyndale returned to command his brigade in the aftermath of the Battle of Gettysburg. Later that Fall, Joseph Hooker was assigned to lead reinforcements to the beleaguered Union Army at Chattanooga. Hooker took with him the XI and XII Corps to which Tyndale's brigade was part of. Tyndale led his brigade at the Battle of Wauhatchie, leading a bayonet charge and turning the enemy's flank. He also took part, albeit in a minor role, in the battle of Chattanooga. On August 26, 1864 Tyndale resigned from the army due to poor health. He was brevetted to major general on March 13, 1865.