▁line ▁further ▁back , ▁on ▁ground ▁less ▁exposed ▁than ▁the ▁K ink . ▁ ▁Background ▁▁ 1 9 1 5 ▁ ▁The ▁Battle ▁of ▁Lo os ▁took ▁place ▁in ▁support ▁of ▁the ▁French ▁aut umn ▁off ensive ▁by ▁the ▁T enth ▁Army , ▁which ▁fought ▁the ▁Third ▁Battle ▁of ▁Ar to is ▁ ▁and ▁the ▁Second ▁and ▁Four th ▁arm ies ▁in ▁the ▁Second ▁Battle ▁of ▁Champ agne ▁. ▁The ▁British ▁attack ▁began ▁on ▁ 2 5 ▁September , ▁when ▁the ▁inf antry ▁advanced ▁behind ▁a ▁cloud ▁gas ▁dis charge , ▁intended ▁to ▁make ▁up ▁for ▁a ▁lack ▁of ▁guns ▁and ▁am mun ition . ▁The ▁ ▁Red ou bt ▁and ▁ ▁were ▁captured ▁by ▁the ▁ 9 th ▁Division . ▁On ▁the ▁night ▁of ▁ ▁German ▁counter - att acks ▁re to ok ▁ground ▁but ▁were ▁rep uls ed ▁at ▁ ▁until ▁another ▁attack ▁on ▁ 2 7 ▁September , ▁when ▁the ▁ ▁was ▁re capt ured . ▁ ▁British ▁attacks ▁to ▁reg ain ▁ ▁began ▁on ▁ 2 8 ▁September ▁but ▁the ▁ ▁Red ou bt ▁was ▁also ▁lost ▁on ▁ 3 ▁October . ▁The ▁British ▁front ▁was ▁re organ ised ▁for ▁another ▁attempt , ▁which ▁due ▁to ▁del ays ▁and ▁bad ▁weather , ▁was ▁forest alled ▁by ▁a ▁German ▁surprise ▁attack ▁on ▁ 8 ▁October , ▁from ▁Lo os ▁to ▁La ▁Bass ée ▁Canal . ▁The ▁delayed ▁British ▁attack ▁went ▁ahead ▁on ▁ 1 3 ▁October , ▁in ▁the ▁Action ▁of ▁the ▁H oh enz oll ern ▁Red ou bt