The complex was later called Richmond Barracks. Some of the present buildings, in the courtyard, were built circa 1714. After the unrest and rebellions of the 1790s and the Act of Union in 1800 the complex was re-fortified and the present tower built. The fort suffered considerable damage during the Irish Civil War. It was occupied by Anti-Treaty forces and on 4 July 1922, it became the target of shelling by the army of the Irish Free State. The Free State Forces under Michael Collins had been given extensive support by the British Army at the express wish of Winston Churchill who insisted that the Republican Forces be crushed. Using the same British Army 18 pounder artillery piece which had shelled the Republican H.Q. in the Four Courts in Dublin some days earlier the Free State Forces bombarded Millmount fort for several hours before the Republican garrison retreated. It has been restored in 2000 and is now open to the public as a military museum.