索姆河
In 1916 the BEF had moved into the Picardy region of France. The Battle of the Somme dominated British military activity for the year. Allied forces attempted to break through the German lines along a front north and south of the River Somme in northern France. On the first day on the Somme the BEF suffered 59,000 casualties. After the war a final tally counted 419,654 British and 204,253 French killed, wounded, or taken prisoner; of the 623,907 total casualties, 146,431 were either killed or missing.