The Battle of Lookout Mountain, also known as the Battle Above the Clouds, was fought November 24, 1863, as part of the Chattanooga campaign of the American Civil War. Union forces under Maj. Gen. Joseph Hooker assaulted Lookout Mountain, Chattanooga, Tennessee, and defeated Confederate forces commanded by Maj. Gen. Carter L. Stevenson. Lookout Mountain was one engagement in the Chattanooga battles between Maj. Gen. Ulysses S. Grant's Military Division of the Mississippi and the Confederate Army of Tennessee, commanded by Gen. Braxton Bragg. It drove in the Confederate left flank and allowed Hooker's men to assist in the Battle of Missionary Ridge the following day, which routed Bragg's army, lifting the siege of Union forces in Chattanooga, and opening the gateway into the Deep South.
After their disastrous defeat at the Battle of Chickamauga, the 40,000 men of the Union Army of the Cumberland under Maj. Gen. William Rosecrans retreated to Chattanooga, Tennessee. Bragg's Army of Tennessee besieged the city, threatening to starve the Union forces into surrender. Bragg's troops established themselves on Missionary Ridge and Lookout Mountain, both of which had excellent views of the city, the Tennessee River flowing through the city, and the Union's supply lines. Lookout Mountain was actually a ridge or narrow plateau that extended 85 miles (137 km) southwest from the Tennessee River, culminating in a sharp point 1,800 feet (550 m) above the river. From the river the end of the mountain rose at a 45° angle and at about two thirds of the way to the summit it changed grade, forming a ledge, or "bench", 150–300 feet (50–90 m) wide, extending for several miles around both sides of the mountain. Above the bench, the grade steepened into a 500-foot (150 m) face of rock called the "palisades". Confederate artillery atop Lookout Mountain controlled access by the river, and Confederate cavalry launched raids on all supply wagons heading toward Chattanooga, which made it necessary for the Union to find another way to feed their men.
The Union government, alarmed by the potential for defeat, sent reinforcements. On October 17, Maj. Gen. Ulysses S. Grant received command of the Western armies, designated the Military Division of the Mississippi. He moved to reinforce Chattanooga and replaced Rosecrans with Maj. Gen. George H. Thomas.
Thomas launched a surprise amphibious landing at Brown's Ferry on October 27 that opened the Tennessee River by linking up Thomas's Army of the Cumberland with a relief column of 20,000 troops from the Eastern Theater's Army of the Potomac, led by Maj. Gen. Joseph Hooker. Supplies and reinforcements were thus able to flow into Chattanooga over the "Cracker Line", greatly increasing the chances for Grant's forces. In response, Bragg ordered Lt. Gen. James Longstreet to force the Federals out of Lookout Valley, directly to the west of Lookout Mountain. The ensuing Battle of Wauhatchie (October 28–29) was one of the war's few battles fought exclusively at night. The Confederates were repulsed, and the Cracker Line was secured.
The American Civil War (1861–1865) was the deadliest conflict in American history, killing an estimated 620,000 to 750,000 soldiers and an unknown number of civilians. The Confederate States of America, formed by eleven seceding Southern states, faced the Union in four years of warfare across 23 states and territories. Major engagements included First and Second Bull Run, Antietam (the bloodiest single day in American history, September 17, 1862), Chancellorsville, Gettysburg (July 1–3, 1863), Vicksburg (surrendered July 4, 1863), and Sherman's March through Georgia and the Carolinas (1864–1865). President Lincoln issued the Emancipation Proclamation on January 1, 1863, transforming the war's stated purpose to include the abolition of slavery and enabling the enlistment of approximately 180,000 Black men in the United States Colored Troops. Confederate General Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House on April 9, 1865. The war resolved the question of secession and ended American slavery, though Reconstruction would face sustained resistance in its attempt to secure civil rights for formerly enslaved people.
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