From Ohio History Central
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The Army of the Cumberland regrouped at Chattanooga. Confederate forces seized the heights, including Missionary Ridge and Lookout Mountain, surrounding the city. Southern artillery prevented supply trains or reinforcements from reaching Rosecrans's army, while it also prohibited the Northerners from retreating. The Northern soldiers were in a dire situation. They had to surrender, starve, or attack a larger, well-fortified force. The stage was set for the Battle of Chattanooga.