William McCool was the son of eldest son of Archibald and Isabella McCool. William McCool was born about 1890 in Glasgow. The family lived in Castledawson,
Like his father and brother, William was a labourer. William enlisted in Glasgow. Private William McCool was serving with the 2nd Battalion of the Highland Light Infantry when he was killed in action on 28th April 1917. He was 27 years old.
The Arras Memorial is in the Faubourg-d'Amiens Cemetery, which is in the Boulevard du General de Gaulle in the western part of the town of Arras. The cemetery is near the Citadel, approximately 2 kms due west of the railway station.