▁two ▁of ▁the ▁Lo yal ▁Regiment ▁( N orth ▁Lanc ash ire ). ▁ ▁First ▁World ▁War ▁The ▁division ▁was ▁mobil ised ▁on ▁ 5 ▁August ▁ 1 9 1 4 , ▁the ▁day ▁after ▁Britain ▁declared ▁war ▁on ▁Germany , ▁thus ▁beginning ▁the ▁Great ▁War . ▁ ▁From ▁late ▁ 1 9 1 4 ▁to ▁early ▁ 1 9 1 5 ▁units ▁of ▁the ▁brig ade ▁began ▁to ▁be ▁sent ▁independently ▁over se as , ▁mainly ▁to ▁France ▁and ▁Belg ium , ▁and ▁were ▁replaced ▁by ▁the ▁ 2 nd ▁Line ▁units ▁being ▁formed , ▁the ▁ 1 7 0 th ▁( 2 / 1 st ▁North ▁Lanc ash ire ) ▁Brigade ▁of ▁ 5 7 th ▁( 2 nd ▁West ▁Lanc ash ire ) ▁Division . ▁To ▁differenti ate ▁the ▁ 1 st ▁Line ▁batt al ions ▁from ▁the ▁ 2 nd ▁Line , ▁the ▁prefix ▁' 1 /' ▁was ▁adopted ▁by ▁all ▁ 1 st ▁Line ▁batt al ions ▁( 1 / 4 th ▁King ' s ▁O wn ) ▁and ▁' 2 /' ▁for ▁all ▁ 2 nd ▁Line . ▁ ▁In ▁April ▁ 1 9 1 5 ▁the ▁ 1 6 4 th ▁Brigade ▁was ▁red es ign ated ▁ 1 5 4 th ▁Brigade ▁and ▁joined ▁the ▁ 5 1 st ▁( High land ) ▁Division . ▁In ▁June ▁ 1 9 1 6 ▁the ▁brig ade , ▁now ▁again ▁red es ign ated ▁ 1 6 4 th ▁( 1 st ▁North ▁Lanc ash ire )