Chickamauga breaks Rosecrans and elevates Thomas

Rosecrans had repeatedly outmaneuvered Braxton Bragg, but a misunderstood order opened a major gap that Confederate forces exploited at Chickamauga. Wounded and psychologically shaken, Rosecrans fell back toward Chattanooga while George H. Thomas organized the defense that preserved the army. Repeated exposure to danger can exhaust even a previously aggressive commander, and the account treats Rosecrans's collapse with sympathy. Grant later preferred the more dependable Thomas despite Rosecrans's earlier operational skill.