Rosecrans did not immediately pursue Bragg and "give the finishing blow to the rebellion" as Stanton urged. He paused to regroup and study the difficult choices of pursuit into mountainous regions. When the campaigning resumed, Bragg's army proved to be only temporarily defeated. Reinforced with additional troops from Lee's Virginia army, Bragg attacked Rosecrans at the Battle of Chickamauga in September and won the only significant Confederate victory in the Western Theater of the war, driving Rosecrans back to Chattanooga and besieging him there.