The brigade advanced behind a creeping barrage .
The brigade suffered heavy casualties , but the general retirement of the Germans along the whole line allowed it to push on through Ploegsteert Wood and advance up to the River Lys on 3 October .
The brigade advanced behind a creeping barrage and suffered heavy casualties , but the general retirement of the Germans along the whole line allowed it to push on through Ploegsteert Wood and advance up to the River Lys on 3 October .