 The first of Fort Greble's works was Battery Hale, completed in 1897 with the emplacement of three 10-inch M1888 disappearing guns.A battery was constructed for one 6-inch Armstrong gun shortly after the war started, but the gun was removed in 1903.This was followed by the establishment of Battery Mitchell on the Armstrong gun site with three 6-inch M1903 disappearing guns, and Battery Sedgwick with eight 12-inch M1890 mortars.