The British Expeditionary Force was sent to the Western Front during World War I. Initially commanded by Field Marshall Sir John French until December 1915, he was replaced by General Sir Douglas Haig. Other countries part of the force were: Indian Expeditionary Force; South African Overseas Expeditionary Force; Canadian Expeditionary Force; New Zealand Expeditionary Force; Australian Imperial Force; and Portuguese Expeditionary Corps.
Image: LC-Lot-9212-6: Hand-tinted postcard that reads, "Firing a Heavy Howitzer in France." Courtesy of the Library of Congress.