The first British troops arrived in France during World War I.
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Unofficial ceasefires sprang up across World War I's Western Front.
American Army Corporal Alvin York and seven men attacked a major German gun nest on their own during World War I.
Third Battle of Ypres begins in Flanders
The United States of America declared neutrality at the beginning of World War I.
Medical researcher Oswald Hope Robertson performed the first-ever blood transfusion using stored and refrigerated blood.
