▁behind ▁the ▁left ▁fl ank ▁of ▁II ▁Corps , ▁towards ▁B aille ul ▁and ▁Ar ment ières . ▁II ▁Corps ▁was ▁to ▁advance ▁around ▁the ▁north ▁of ▁L ille ▁and ▁III ▁Corps ▁was ▁to ▁reach ▁a ▁line ▁from ▁Ar ment ières ▁to ▁W yt sch a ete , ▁with ▁the ▁Caval ry ▁Corps ▁( L ie utenant - General ▁Edmund ▁Allen by , ▁ 1 st ▁Vis count ▁Allen by ) ▁on ▁the ▁left ▁as ▁far ▁as ▁Y pres . ▁French ▁troops ▁were ▁to ▁rel ieve ▁the ▁II ▁Corps ▁at ▁Bé th une ▁to ▁move ▁north ▁and ▁link ▁with ▁the ▁right ▁of ▁III ▁Corps ▁but ▁this ▁did ▁not ▁occur . ▁On ▁the ▁northern ▁fl ank ▁of ▁III ▁Corps , ▁in ▁front ▁of ▁the ▁Caval ry ▁Corps ▁was ▁a ▁line ▁of ▁hills ▁from ▁Mont ▁des ▁C ats ▁to ▁M t . ▁K em mel , ▁about ▁ ▁above ▁sea ▁level , ▁with ▁sp urs ▁running ▁south ▁across ▁the ▁British ▁line ▁of ▁ ▁advance , ▁occupied ▁by ▁the ▁German ▁IV ▁Caval ry ▁Corps ▁with ▁three ▁divisions . ▁On ▁ 1 2 ▁October , ▁the ▁British ▁caval ry ▁advanced ▁and ▁captured ▁the ▁Mont ▁des ▁C ats . ▁ ▁On ▁ 1 3 ▁October , ▁III ▁Corps ▁found ▁German ▁troops ▁d ug ▁in ▁along ▁the ▁Meter en bec que . ▁A ▁corps ▁attack ▁from ▁La ▁Cour onne ▁to ▁Font aine ▁Hou ck ▁began ▁at ▁ ▁in ▁wet ▁and ▁mist y ▁weather ▁and ▁by ▁evening ▁had ▁captured ▁Out ter ste ene ▁and ▁Mé ter en , ▁at ▁a