On November 24, 1863, the Union forces under the command of General Joseph Hooker launched a surprise assault on Confederate positions on Lookout Mountain. Hooker's men quickly overran the Confederate defenses, and by nightfall, they had control of the mountain.
This victory was a significant boost to the morale of the Union troops. It showed that they were capable of defeating the Confederates in a pitched battle, and it gave them confidence as they prepared for the next phase of the Battle of Chattanooga.
The following day, the Union forces launched a massive assault on the Confederate positions at Missionary Ridge. The battle was hard-fought, but the Union forces eventually prevailed, and by nightfall, they had control of the ridge.
The Union victory at the Battle of Chattanooga was a major turning point in the Civil War. It gave the Union control of Tennessee and opened the way for the invasion of Georgia. It also boosted the morale of the Union troops and showed that they were capable of defeating the Confederates in a large-scale battle.