Percy William Underwood was born in 1890 in Calgary, Alberta to Thomas and Kathryn Underwood.
Percy was a University student when he enlisted with the 8th Field Ambulance, 3rd Canadian Division in January 1916, and was sent to England the following April.
Not long afterwards he arrived in the Ypres Salient in Belgium, where he served as a stretcher bearer during the Battle of Mount Sorrel in June 1916. He also carried wounded soldiers from the battlefields of the Somme, and served during the Battle of Vimy Ridge and Hill 70, in 1917.
His last act of service was during the Battle of Passchendaele, when he was killed on 14 November, 1917 by an artillery shell while making his way forward to an advanced dressing station near Mosselmarkt. His body was never recovered. His name is engraved on the Menin Gate in Ypres, Belgium.