The first British troops arrived in France during World War I.
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Medical researcher Oswald Hope Robertson performed the first-ever blood transfusion using stored and refrigerated blood.
A German U-Boat sinks the RMS Lusitania.
During World War I, Japan officially declared war on Germany.
After nearly four and a half years of cataclysmic conflict, World War I ended.
The Treaty of London was signed by Italy, Britain, France, and Russia.
