ual ties ▁since ▁the ▁beginning ▁of ▁the ▁war , ▁ ▁at ▁Y pres ) ▁and ▁that ▁ ▁percent ▁of ▁the ▁Belg ian ▁army ▁had ▁become ▁cas ual ties . ▁ ▁Sub sequ ent ▁operations ▁ ▁First ▁Battle ▁of ▁Fland ers ▁ ▁Battle ▁of ▁the ▁Y ser , ▁ 1 8 ▁October ▁– ▁ 3 0 ▁November ▁ ▁During ▁the ▁Al lied ▁retre at ▁from ▁Ant werp , ▁the ▁British ▁IV ▁Corps ▁moved ▁north ▁of ▁Y pres ▁on ▁ 1 4 ▁October , ▁where ▁I ▁Corps ▁arrived ▁on ▁ 1 9 ▁October , ▁with ▁caval ry ▁covering ▁a ▁gap ▁to ▁the ▁south ▁of ▁the ▁town . ▁The ▁Battle ▁of ▁the ▁Y ser ▁ ▁was ▁fought , ▁along ▁a ▁ ▁stretch ▁of ▁the ▁Y ser ▁river ▁and ▁Y per lee ▁Canal ▁in ▁Belg ium . ▁Fal ken h ay n ▁created ▁a ▁new ▁ 4 th ▁Army ▁to ▁capture ▁D unk irk ▁and ▁Cal ais ▁to ▁inf lict ▁an ▁" ann ih il ating ▁blow ". ▁The ▁retre at ▁of ▁the ▁Bel gi ans ▁to ▁the ▁Y ser ▁ended ▁the ▁" R ace ▁to ▁the ▁Sea ", ▁with ▁the ▁Bel gi ans ▁holding ▁a ▁ ▁front ▁south wards ▁from ▁the ▁coast ▁and ▁Belg ian , ▁French ▁and ▁British ▁troops ▁holding ▁another ▁ ▁beyond , ▁the ▁BE F ▁holding ▁ ▁and ▁the ▁T enth ▁Army ▁holding ▁another ▁ ▁on ▁the ▁extreme ▁right ▁fl ank ▁of ▁the ▁northern ▁front . ▁ ▁German ▁attacks ▁began ▁on ▁ 1 8 ▁October ▁and ▁on ▁ 2 2 ▁October , ▁German