Battle of Chickamauga

A major Confederate victory over Union forces in northwestern Georgia, fought September 19–20, 1863. It was the bloodiest battle of the American Civil War’s western theater.

William Rosecrans: A Union general who commanded the Army of the Cumberland during the Chickamauga campaign. His orders to close a supposed gap helped create the opening that broke the Union line.
Chattanooga Campaign: A 1863 military campaign in which Union forces captured Chattanooga and Confederate forces sought to recover it. Chickamauga was the campaign’s major battle before the Union siege of Chattanooga.
Siege of Chattanooga: The Confederate investment of Union forces in Chattanooga after the Battle of Chickamauga, lasting from September to November 1863. Bragg’s victory forced Rosecrans’s army into the city, where it faced a supply crisis.
Union gap at Chickamauga: An opening in the Union line on September 20, 1863, created during a mistaken troop movement. Confederate troops struck through it and divided the Union position.
Braxton Bragg: A Confederate general who commanded the Army of Tennessee at Chickamauga. His army won the field, despite coordination failures among its commanders.
Tullahoma Campaign: A Union campaign in Tennessee in June and July 1863 that forced Confederate forces to withdraw toward Chattanooga. Rosecrans’s advance drove Bragg from Middle Tennessee and set the campaign in motion.
Battle of Lookout Mountain: A Union assault on Confederate positions at Lookout Mountain on November 24, 1863. It formed part of the Union offensive that broke the siege established after Chickamauga.
Longstreet's breakthrough at Chickamauga: The Confederate assault on September 20, 1863, that exploited the opening in the Union line. It routed much of Rosecrans’s force and secured the Confederate victory.
George Thomas: A Union general whose troops held positions at Chickamauga and covered the retreat toward Chattanooga. His defense at Snodgrass Hill prevented the Confederate victory from becoming a rout.
Chattanooga: A city in southeastern Tennessee that became a strategic rail and supply hub during the Civil War. The armies fought at Chickamauga to control this gateway into the Deep South.

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