Battle of Missionary Ridge - Background

Background

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. Confederate General Braxton 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. The only supply line that was not controlled by the Confederates was a roundabout, tortuous course nearly 60 miles long over Walden's Ridge from Bridgeport, Alabama. Heavy rains began to fall in late September, washing away long stretches of the mountain roads. On October 1, Maj. Gen. Joseph Wheeler's Confederate cavalry intercepted and severely damaged a train of 800 wagons—burning hundreds of the wagons, and shooting or sabering hundreds of mules—at the start of his October 1863 Raid through Tennessee to sever Rosecrans's supply line. Toward the end of October, Federal soldiers' rations were "four cakes of hard bread and a quarter pound of pork" every three days.

The Union government sent reinforcements: Maj. Gen. Joseph Hooker with 15,000 men in two corps from the Army of the Potomac in Virginia and Maj. Gen. William T. Sherman with 20,000 men from Vicksburg, Mississippi. 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 his Army of the Cumberland with Hooker's relief column southwest of the city, thus allowing supplies and reinforcements to flow into Chattanooga over what was called the "Cracker Line". In response, Bragg ordered Lt. Gen. James Longstreet to force the Federals out of Lookout Valley. 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.

Sherman arrived with his 20,000 men of the Army of the Tennessee in mid-November. Grant, Sherman, and Thomas planned a double envelopment of Bragg's force, with the main attack by Sherman against the northern end of Missionary Ridge, supported by Thomas in the center and by Hooker, who would capture Lookout Mountain and then move across the Chattanooga Valley to Rossville, Georgia, and cut off the Confederate retreat route to the south.

On November 23, Sherman's force was ready to cross the Tennessee River. Grant ordered Thomas to advance halfway to Missionary Ridge on a reconnaissance in force to determine the strength of the Confederate line, hoping to ensure that Bragg would not withdraw his forces and move in the direction of Knoxville, Tennessee, where Maj. Gen. Ambrose Burnside was being threatened by a Confederate force under Lt. Gen. James Longstreet. Thomas sent over 14,000 men toward a minor hill named Orchard Knob and overran the Confederate defenders. Grant changed his orders and instructed Thomas's men to dig in and hold the position.

Surprised by Thomas's move and realizing that his center and right might be more vulnerable than he had thought, Bragg quickly readjusted his strategy. Bragg assigned Col. Warren Grigsby's brigade of Kentucky cavalry to picket the Tennessee river northeast of Chattanooga and ordered Brig. Gen. Marcus Joseph Wright to bring his brigade of Tennessee infantry from Cleveland, Tennessee, by train to Chickamauga Station. He recalled all units he had recently ordered to Knoxville if they were within a day's march. Maj. Gen. Patrick R. Cleburne's division returned after dark from Chickamauga Station, interrupting the process of boarding the trains. Bragg began to reduce the strength on his left by withdrawing Maj. Gen. William H. T. Walker's division from the base of Lookout Mountain and placing them on the far right of Missionary Ridge, just south of Tunnel Hill. He assigned Lt. Gen. William J. Hardee to command his now critical right flank, turning over the left flank to Maj. Gen. Carter L. Stevenson. Bragg's concern for his right proved justified and his decisions were fortuitous. In the center, Maj. Gen. John C. Breckinridge ordered his men to begin fortifying the crest of Missionary Ridge, a task that Bragg had somehow neglected for weeks. Unable to decide whether to defend the base or the crest of the Ridge, the divisions of Brig. Gens. William B. Bate and J. Patton Anderson were ordered to move half of their divisions to the crest, leaving the remainder in the rifle pits along the base. James L. McDonough wrote of the upper entrenchments, "Placed along the physical crest rather than what is termed the military crest ... these works severely handicapped the defenders."

November 24 was dark, with low clouds, fog, and drizzling rain. Sherman's force crossed the Tennessee River successfully in the morning then took the set of hills at the north end of Missionary Ridge, although he was surprised to find that a valley separated him from the main part of the ridge. Alerted by Grigsby's cavalry that the enemy had crossed the river in force, Bragg sent Cleburne's division and Wright's brigade to challenge Sherman. After skirmishing with the Confederates, Sherman ordered his men to dig in on the hills he had seized. Cleburne, likewise, dug in around Tunnel Hill.

At the same time, Hooker's command succeeded in the Battle of Lookout Mountain and prepared to move east toward Bragg's left flank on Missionary Ridge. The divisions of Stevenson and Cheatham retreated behind Chattanooga Creek, burning the bridges behind them.

On the night of November 24, Bragg asked his two corps commanders whether to retreat or to stand and fight. Cleburne, concerned about what Sherman had accomplished, expected Bragg to retreat. Hardee also counseled retreat, but Breckinridge convinced Bragg to fight it out on the strong position of Missionary Ridge. Accordingly, the troops withdrawn from Lookout Mountain were ordered to the right wing to assist in repelling Sherman.