During a renovation project in the 1870s, the fort received 12 200-pounder Parrott rifled cannons. Eventually, the U.S. Government abandoned the fort, letting it fall into disrepair. Then, under the presidency of
Grover Cleveland, Secretary of War
William Endicott chaired the
Endicott Board, which led to a program of building new concrete batteries. Between 1895 and 1900, Fort Morgan received five concrete batteries with fire control, electricity, and communications. The first battery, Battery Bowyer, was operational during the
Spanish–American War. It had four
8-inch breech-loading guns on
disappearing carriages. The battery closed in 1917, and the guns were removed for conversion to
railway guns for service in Europe in
World War I. At the beginning of the Spanish–American War, Fort Morgan also received eight 10-inch smooth-bore muzzle-loading
Rodman cannons, converted to 8-inch rifles with the insertion of a barrel sleeve. This was a makeshift, and the U.S. Army later gave the guns away to cities for Civil War memorials. The second battery, completed in 1900, was Battery Dearborn, named for Major General
Henry Dearborn. The battery had eight breech-loading
12-inch coast defense mortars in two four-gun pits. The intent was that the mortars would rain down shells on the vessels' less heavily armored decks if enemy vessels approached. The third battery, also completed in 1900, was Battery Duportail, named for Major General
Louis Lebègue Duportail. Its armament consisted of two
12-inch breech-loading rifles on disappearing carriages. The battery was decommissioned in 1923. The Army removed the breechblocks and plugged the breeches before abandoning the guns. The Army scrapped the guns in the early 1940s. The fourth battery was Battery Thomas, named for Captain Evan Thomas, who had been killed in the Battle of Sand Butte in 1873 during the
Modoc War. This battery's armament consisted of two British
4.7-inch rapid-fire Armstrong guns. The battery's role was to prevent smaller enemy vessels from passing through the ship's channel in front of the fort. The battery was deactivated in 1917, and its guns were removed. The fifth battery was Battery Schenk, named for Lieutenant William T. Schenck, who was killed in action in
Luzon in 1900 during the
Philippine–American War. The battery initially held two, later increased to three,
3-inch rapid-fire guns. It also protected the ship channel. ==20th century==