About how many soldiers fought on the Union side at Chattanooga?

At the Battle of Chattanooga, which took place in late 1863, approximately 60,000 Union soldiers participated. This battle was a significant engagement in the American Civil War, involving a series of conflicts aimed at securing control of the strategic city of Chattanooga, Tennessee. The Union forces, under the command of General Ulysses S. Grant, successfully defeated the Confederate army, leading to a crucial victory for the Union.