  km ) ▁n ortheast ▁of ▁dow nt own ▁Ch att ano oga ). ▁ ▁After ▁his ▁successful ▁Tul lahoma ▁Camp aign , ▁Rose cr ans ▁renew ed ▁the ▁off ensive , ▁aim ing ▁to ▁force ▁the ▁Confeder ates ▁out ▁of ▁Ch att ano oga . ▁In ▁early ▁September , ▁Rose cr ans ▁cons olid ated ▁his ▁forces ▁scattered ▁in ▁Tennessee ▁and ▁Georgia ▁and ▁forced ▁B rag g ' s ▁army ▁out ▁of ▁Ch att ano oga , ▁heading ▁south . ▁The ▁Union ▁troops ▁followed ▁it ▁and ▁br ushed ▁with ▁it ▁at ▁Davis ' s ▁Cross ▁Ro ads . ▁B rag g ▁was ▁determined ▁to ▁re occup y ▁Ch att ano oga ▁and ▁decided ▁to ▁meet ▁a ▁part ▁of ▁Rose cr ans ' s ▁army , ▁defeat ▁it , ▁and ▁then ▁move ▁back ▁into ▁the ▁city . ▁On ▁September ▁ 1 7 ▁he ▁head ed ▁north , ▁int ending ▁to ▁attack ▁the ▁isolated ▁XX I ▁Corps . ▁As ▁B rag g ▁march ed ▁north ▁on ▁September ▁ 1 8 , ▁his ▁caval ry ▁and ▁inf antry ▁fought ▁with ▁Union ▁caval ry ▁and ▁mounted ▁inf antry , ▁which ▁were ▁armed ▁with ▁Sp encer ▁repeating ▁rif les . ▁ ▁Fight ing ▁began ▁in ▁earnest ▁on ▁the ▁morning ▁of ▁September ▁ 1 9 . ▁B rag g ' s ▁men ▁strongly ▁assault ed ▁but ▁could ▁not ▁break ▁the ▁Union ▁line . ▁The ▁next ▁day , ▁B rag g ▁res umed ▁his ▁assault . ▁In ▁late ▁morning , ▁Rose cr ans ▁was ▁mis in formed ▁that ▁he