By November 1917, he was assigned to Company F along with Corporal James Bethel Gresham and Private Thomas Enright.
After an hour of fighting, Hay, Corporal Gresham, and Private Enright were the first three casualties of the American Expeditionary Force.
An inscription marked their graves: "Here lie the first soldiers of the illustrious Republic of the United States who fell on French soil for justice and liberty."
Hay was then re-interred in July 1921 in West Lawn Cemetery in his home town of Glidden, Iowa.
Robert M. Losey, a military attache, was killed on April 21, 1940, during a German bombardment of Dombås, Norway.