Thomas Lagan was born in Draperstown. Private Thomas Lagan was serving with the 2nd Battalion of the Cameronians (Scottish Rifles) when he died on Thursday 21st January 1915. Private Thomas Lagan is buried in Boulogne Eastern Cemetery. Boulogne and Wimereux formed one of the chief hospital areas during World War One.
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.