▁night fall , ▁' G ro ver ' s ▁Force ' ▁blocked ▁the ▁way ▁to ▁Cha un y ▁on ▁the ▁St ▁Qu entin ▁Canal , ▁with ▁the ▁combined ▁ 2 / 4 th ▁and ▁ 8 th ▁Lond ons ▁to ▁his ▁left ▁and ▁the ▁ 1 8 th ▁En tr en ch ing ▁Battalion ▁( formed ▁from ▁dis band ed ▁batt al ions ▁of ▁ 1 8 th ▁Division ) ▁to ▁his ▁right ▁ast ride ▁the ▁canal . ▁ ▁The ▁mixed ▁force ▁under ▁ 1 7 3 rd ▁B de ▁held ▁out ▁on ▁the ▁fourth ▁day ▁of ▁the ▁battle ▁until ▁the ▁afternoon , ▁when ▁they ▁made ▁a ▁planned ▁withdraw al , ▁and ▁by ▁ 1 6 . 3 0 ▁had ▁retired ▁across ▁the ▁O ise ▁to ▁join ▁the ▁rest ▁of ▁ 5 8 th ▁Division . ▁Here ▁a ▁composite ▁' F us il ier ▁Battalion ' ▁was ▁formed ▁under ▁L t - Col ▁D ann ▁of ▁the ▁ 2 / 4 th , ▁with ▁a ▁company ▁drawn ▁from ▁each ▁of ▁the ▁ 2 / 2 nd , ▁ 3 rd , ▁ 2 / 4 th ▁and ▁ 8 th ▁Lond ons , ▁which ▁held ▁the ▁river ▁cross ings ▁until ▁rel ieved ▁on ▁the ▁night ▁of ▁ 2 5 / 2 6 ▁March . ▁Out ▁of ▁the ▁line , ▁Gro ver ' s ▁Force ▁and ▁the ▁F us il ier ▁Battalion ▁were ▁re organ ised , ▁so ▁that ▁the ▁F us il ier ▁Battalion ▁now ▁represented ▁the ▁whole ▁of ▁ 1 7 3