In 1920 , Lt. Col. Montgomery was seconded to the British Army Intelligence Corps in Dublin during the Irish War of Independence . He was part of the Cairo Gang , a group of British spymasters whose deaths were ordered by Michael Collins as part of Bloody Sunday . On 21 November 1920 , Collins ' Twelve Apostles entered Montgomery 's lodgings at 28 Pembroke Street and shot him . Lt. Col. Montgomery died of his wounds almost three weeks later . He was buried with full military honours at Brompton Cemetery
Bloody Sunday
Bloody Sunday (1920)
Hugh Montgomery (Royal Marines officer)