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World War I, also known as the First World War, the Great War, the War of the Nations, and the War to End All Wars.

It was a world conflict which lasted over four years from August 1914 to November 11, 1918 - the day of Armistice when hostilities ended and the Allies achieved victory.

The Allied Powers principally the British Empire, France and the United States defeated the Central Powers of Europe - Germany, the Austro-Hungarian and the Ottoman Empire.

The number of World War I casualties is a subject of much debate although some estimates put the figure as high as 37 million (military and civilian) casualties with over 22 million wounded and some 15 million killed.
The number of military deaths is put at approximately 9 million with the Allied Powers losing some 5 million soldiers.

Familyrelatives.com is the only Family History website that allows you to search for soldiers who died in World War I by any criteria. The information available is comprised of the indexes to the Deaths of World War I soldiers, sailors and airmen. You can search on the following criteria:

GRO War Deaths Navy All Ranks Indices 1914-1921

The information can be searched on the following criteria.