▁and ▁ 7 th ▁caval ry ▁divisions , ▁against ▁the ▁attempted ▁French ▁en velop ment . ▁The ▁attack ▁was ▁cancel led ▁and ▁the ▁corps ▁with d rew ▁behind ▁the ▁right ▁fl ank ▁of ▁the ▁ 1 st ▁Army . ▁The ▁ 2 nd ▁and ▁ 9 th ▁caval ry ▁divisions ▁were ▁sent ▁next ▁day ▁but ▁the ▁French ▁attack ▁reached ▁Car le pont ▁and ▁No y on , ▁before ▁being ▁contained ▁on ▁ 1 8 ▁September . ▁In ▁the ▁Battle ▁of ▁F li rey , ▁the ▁German ▁arm ies ▁attacked ▁from ▁Verd un ▁west ▁to ▁Re ims ▁and ▁the ▁A is ne ▁on ▁ 2 0 ▁September , ▁cut ▁the ▁main ▁railway ▁from ▁Verd un ▁to ▁Paris ▁and ▁created ▁the ▁St ▁Mih iel ▁sal ient . ▁The ▁main ▁German ▁effort ▁remained ▁on ▁the ▁western ▁fl ank , ▁which ▁the ▁French ▁discovered ▁by ▁intercept ing ▁wireless ▁messages . ▁By ▁ 2 8 ▁September , ▁the ▁A is ne ▁front ▁had ▁stabil ised ▁and ▁the ▁BE F ▁began ▁to ▁withdraw ▁on ▁the ▁night ▁of ▁ ▁with ▁the ▁first ▁troops ▁arriv ing ▁in ▁the ▁Ab be ville ▁area ▁on ▁ ▁P rel ude ▁ ▁German ▁plan ▁of ▁attack ▁ ▁After ▁the ▁defeat ▁on ▁the ▁Mar ne , ▁Mol t ke ▁ordered ▁a ▁ret irement ▁to ▁the ▁A is ne ▁by ▁the ▁ 1 st ▁and ▁ 2 nd ▁arm ies ▁on ▁the ▁German ▁right ▁wing ▁and ▁a ▁withdraw al ▁to ▁Re ims ▁and ▁a ▁line ▁east wards ▁past ▁the ▁north ▁of ▁Verd un , ▁by ▁the ▁