Boom Hall is a house and demesne in Derry, Northern Ireland. Lying close to the west bank of the River Foyle, a fort was constructed on the site during the English Civil War. During the Williamite War in Ireland a boom was constructed across the river to try to prevent Williamite forces relieving the Siege of Derry. A two-storey country house was subsequently built on the site by the Alexander family and named after this boom. The estate was later leased to a number of people until a leasehold was sold to Daniel Baird in 1849 by The 3rd Earl of Caledon. This was inherited by Daniel Baird Maturin-Baird who also purchased the freehold from the Alexanders. Boom Hall was again let to a number of different people, with Michael Henry McDevitt living there from 1924. During the Second World War,