▁Territ orial ▁divisions ▁from ▁L ens ▁to ▁L ille ▁and ▁on ▁ 5 ▁October , ▁Mar witz ▁ordered ▁the ▁caval ry ▁to ▁advance ▁west wards ▁to ▁Ab be ville ▁on ▁the ▁Channel ▁coast ▁and ▁cut ▁the ▁rail ways ▁leading ▁south . ▁At ▁the ▁end ▁of ▁ 6 ▁October , ▁Fal ken h ay n ▁terminated ▁attempts ▁by ▁the ▁ 2 nd ▁Army ▁to ▁break ▁through ▁in ▁Pic ard y . ▁To ▁the ▁north , ▁the ▁I ▁and ▁II ▁Caval ry ▁corps ▁attacked ▁between ▁L ens ▁and ▁L ille ▁and ▁were ▁quickly ▁forced ▁back ▁behind ▁the ▁Lor ette ▁Sp ur . ▁Next ▁day , ▁the ▁caval ry ▁was ▁attacked ▁by ▁the ▁first ▁troops ▁of ▁the ▁French ▁XX I ▁Corps ▁to ▁arrive ▁as ▁they ▁advanced ▁east wards ▁from ▁Bé th une . ▁ ▁Third ▁phase , ▁ 1 5 ▁October – Nov ember ▁ ▁Battle ▁of ▁La ▁Bass ée , ▁ 1 0 ▁October ▁– ▁ 2 ▁November ▁ ▁The ▁German ▁ 6 th ▁Army ▁took ▁L ille ▁before ▁a ▁British ▁force ▁could ▁secure ▁the ▁town ▁and ▁the ▁ 4 th ▁Army ▁attacked ▁the ▁exposed ▁British ▁fl ank ▁at ▁Y pres . ▁On ▁ 9 ▁October , ▁the ▁German ▁XIV ▁Corps ▁arrived ▁opposite ▁the ▁French ▁and ▁the ▁German ▁ 1 st ▁and ▁ 2 nd ▁Caval ry ▁corps ▁tried ▁a ▁fl ank ing ▁move ▁between ▁La ▁Bass ée ▁and ▁Ar ment ières ▁but ▁the ▁French ▁caval ry ▁stopped ▁the ▁Germ ans ▁north ▁of ▁La ▁Bass ée ▁Canal . ▁The ▁German ▁ 4 th ▁Caval ry