. ▁On ▁the ▁right ▁fl ank , ▁McC ook ' s ▁XX ▁Corps ▁moved ▁south west ▁to ▁Valley ▁Head , ▁Alabama ; ▁in ▁the ▁center , ▁Thomas ' s ▁XIV ▁Corps ▁moved ▁just ▁across ▁the ▁border ▁to ▁Tr ent on , ▁Georgia ; ▁and ▁on ▁the ▁left , ▁C ritt enden ' s ▁XX I ▁Corps ▁moved ▁directly ▁toward ▁Ch att ano oga ▁around ▁Look out ▁Mountain . ▁On ▁September ▁ 8 , ▁after ▁learning ▁that ▁Rose cr ans ▁had ▁crossed ▁into ▁his ▁rear , ▁B rag g ▁ev acu ated ▁Ch att ano oga ▁and ▁moved ▁his ▁army ▁south ▁along ▁the ▁La F ay ette ▁Road ▁toward ▁La F ay ette , ▁Georgia . ▁The ▁Union ▁army ▁occupied ▁Ch att ano oga ▁on ▁September ▁ 9 . ▁Rose cr ans ▁te legraph ed ▁Halle ck , ▁" Ch att ano oga ▁is ▁our s ▁without ▁a ▁struggle ▁and ▁East ▁Tennessee ▁is ▁free ." ▁B rag g ▁was ▁aware ▁of ▁Rose cr ans ' s ▁dispos itions ▁and ▁planned ▁to ▁defeat ▁him ▁by ▁attack ing ▁his ▁isolated ▁corps ▁individually . ▁The ▁corps ▁were ▁spread ▁out ▁over ▁ 4 0 ▁miles ▁( 6 5   km ), ▁too ▁far ▁apart ▁to ▁support ▁each ▁other . ▁ ▁Rose cr ans ▁was ▁convinced ▁that ▁B rag g ▁was ▁dem oral ized ▁and ▁fle eing ▁to ▁either ▁Dal ton , ▁Rome , ▁or ▁Atlanta , ▁Georgia . ▁Instead , ▁B rag g ' s ▁Army ▁of ▁Tennessee ▁was ▁enc amp ed ▁at ▁La F ay ette ,