▁the ▁afternoon , ▁German ▁attacks ▁began ▁at ▁D ix m ude ▁and ▁next ▁day ▁the ▁III ▁Corps ▁occupied ▁Ar ment ières . ▁On ▁ 1 8 ▁October , ▁the ▁III ▁Corps ▁was ▁ordered ▁to ▁join ▁an ▁off ensive ▁by ▁the ▁BE F ▁and ▁the ▁French ▁army , ▁by ▁attack ing ▁down ▁the ▁L ys ▁valley . ▁Part ▁of ▁P ér en ch ies ▁r idge ▁was ▁captured ▁but ▁much ▁stronger ▁German ▁def ences ▁were ▁encountered ▁and ▁the ▁inf antry ▁were ▁ordered ▁to ▁dig ▁in . ▁On ▁the ▁night ▁of ▁ ▁the ▁III ▁Corps ▁held ▁a ▁line ▁from ▁Rad ing hem ▁to ▁Pont ▁Rou ge , ▁west ▁of ▁L ille . ▁The ▁encounter ▁battle ▁ended ▁and ▁subsequent ▁operations ▁in ▁the ▁Battle ▁of ▁Ar ment ières ▁took ▁place ▁after ▁the ▁end ▁of ▁the ▁Race ▁to ▁the ▁Sea ▁during ▁the ▁First ▁Battle ▁of ▁Y pres ▁ ▁November ). ▁ ▁After math ▁ ▁Analysis ▁ ▁From ▁ ▁the ▁bell iger ents ▁had ▁made ▁un success ful ▁reci pro cal ▁attempts ▁to ▁turn ▁the ▁northern ▁fl ank ▁of ▁their ▁oppon ent . ▁A ▁German ▁off ensive ▁began ▁by ▁ 2 1 ▁October ▁but ▁the ▁ 4 th ▁and ▁ 6 th ▁arm ies ▁were ▁only ▁able ▁to ▁take ▁small ▁amounts ▁of ▁ground ▁at ▁great ▁cost ▁to ▁both ▁sides , ▁at ▁the ▁Battle ▁of ▁the ▁Y ser ▁ ▁and ▁further ▁south ▁at ▁Y pres . ▁Fal ken h ay n ▁then ▁attempted ▁to ▁achieve ▁a ▁limited ▁goal ▁of ▁capt uring ▁Y pres ▁and ▁Mount ▁K em mel , ▁in