William John Rainey was the son of George and Mary Rainey. He was born on 13th May 1886 in Errigal, Ballygawley, County Tyrone. He was one of nine children, all born in the Ballygawley area. Lance Corporal William John Rainey was serving with the 2nd Battalion of the Irish Guards when he was died on 4th May 1918.
Boulogne-sur-Mer is a large Channel port. Boulogne Eastern Cemetery, one of the town cemeteries, lies in the district of St Martin Boulogne, just beyond the eastern (Chateau) corner of the Citadel (Haute-Ville). The cemetery is a large civil cemetery, split in two by the Rue de Dringhen, just south of the main road (RN42) to St Omer. The Commonwealth War Graves plot is located down the western edge of the southern section of the cemetery, with an entrance in the Rue de Dringhen. Car parking is available along the Rue de Dringhen.