Several boards have been appointed by US presidents or Congress to evaluate the US defensive fortifications, primarily coastal defenses near strategically important harbors on the US shores, its territories, and its protectorates.
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In 1885 US President Grover Cleveland appointed a joint Army, Navy and civilian board, headed by Secretary of War William Crowninshield Endicott, known as the Board of Fortifications (now usually referred to simply as the Endicott Board). The findings of the Board in its 1886 report[1] illustrated a grim picture of neglect of America's coast defenses and recommended a massive $127 million construction program for a series of new forts with breech-loading cannons, mortars, floating batteries, and submarine mines for some 29 locations on the US coast. Coast Artillery fortifications built between 1885 and 1905 are often referred to as Endicott Period fortifications.
Prior efforts at harbor defense construction had ceased in the 1870s. Since that time the design and construction of heavy ordnance had advanced rapidly, including the development of superior breech-loading and longer-range cannon, making U.S. harbor defenses obsolete. In 1883, the Navy had begun a new construction program with an emphasis on offensive rather than defensive warships, and many foreign powers were building more heavily armored warships with larger guns. These factors combined to create a need for improved coastal defense systems.
The Endicott Board's recommendations led to a large-scale modernization program of harbor and coast defenses in the United States, including the construction of modern reinforced concrete fortifications and the installation of new batteries of large-caliber (12-inch, 10-inch, 8-inch, and 6-inch) breech-loading rifled artillery and mortars. Fields of electrically controlled submarine mines were also a critical component of the new defenses, as were smaller guns (less than 5-inch caliber) used to protect the mine fields from minesweeping vessels and the larger guns from land attack.
The fortifications constructed as part of this program were a departure from the traditional masonry forts concealing massed batteries of smooth-bore cannon that had dominated U.S. harbor defense for most the 19th century. Instead, smaller batteries of up to four large caliber rifled guns each were installed in well-constructed emplacements hidden behind earth-covered concrete parapets. Most long-range, large-caliber rifles were mounted on disappearing carriages that would allow a gun to be raised to fire, but otherwise remain protected from the enemy's view or fire behind a protective parapet. Some large guns and most smaller guns were mounted on less expensive barbettes or pedastals(see table below).
In 1905, after the experiences of the Spanish-American War, President Theodore Roosevelt appointed a new board, under secretary of war William Howard Taft. They updated some standards and reviewed the progress on the Endicott Board's program. Most of the changes recommended by the Taft Board were technical, such as adding more searchlights, electrification (lighting, communications, and projectile handling), and more sophisticated optical aiming techniques. The Board also recommended fortifications in territories acquired from Spain (Cuba and the Philippines), as well as Hawaii, and a few other sites. Defenses in Panama were authorized by the Spooner Act of 1902. The Taft program fortifications differed slightly in battery construction and had fewer numbers of guns at a given location than those of the Endicott program.
By the time of the First World War, many of the Endicott and Taft era forts had become obsolete due to the increased range and accuracy of naval weaponry and the advent of aircraft. In the 1920s and 1930s, most U.S. coast defense facilities were put on "maintenance" status, a type of "mothballing." In the late 1930s and early 1940s, a new program of construction added huge 16-inch gun batteries, as well as rapid-firing 6-inch and 90 mm guns guns (for use against motor torpedo boats) to many harbors' defenses, and large fields of submarine mines were still being deployed as well. But as it became clearer that the U.S. was unlikely to face seaborne attack, these defenses were largely discontinued (by 1945), and were decommissioned altogether after 1946.
The following is summarized from American Seacoast Defenses, edited by Mark Berhow, with pages referenced from the rows. The units column reflects the lower of the original emplacements or the carriages built, since some emplacements were not armed and some carriages not used. Carriage models after 1905 are not included in the Endicott Era table.
| Model | Carriage | Tube | Caliber | Units | Page |
|---|---|---|---|---|---|
| M1901 | disappearing | rifle | 12 inch | 13 | 150 |
| M1897 | disappearing | rifle | 12 inch | 35 | 148 |
| M1897 | Altered | rifle | 12 inch | 3 | 146 |
| M1896 | Mortar | Mortar | 12 inch | 308 | 140 |
| M1896 | disappearing | rifle | 12 inch | 27 | 138 |
| M1892 | disappearing | rifle | 12 inch | 28 | 136 |
| M1891 | Mortar | Mortar | 12 inch | 86 | 134 |
| M1888 | lift | rifle | 12 inch | 2 | 130 |
| M1901 | disappearing | rifle | 10 inch | 16 | 128 |
| M1896 | disappearing ARF | rifle | 10 inch | 3 | 126 |
| M1896 | disappearing | rifle | 10 inch | 74 | 124 |
| M1894 | disappearing | rifle | 10 inch | 35 | 122 |
| M1893 | barbette | rifle | 10 inch | 9 | 120 |
| M1896 | disappearing | rifle | 8 inch | 38 | 110 |
| M1894 | disappearing | rifle | 8 inch | 26 | 108 |
| M1892 | barbette | rifle | 8 inch | 9 | 106 |
| M1905 | disappearing | rifle | 6 inch | 33 | 100 |
| M1903 | disappearing | rifle | 6 inch | 90 | 98 |
| M1900 | pedestal | rifle | 6 inch | 44 | 96 |
| M1898 | disappearing | rifle | 6 inch | 29 | 94 |
| Armstrong | pedestal | rifle | 6 inch | 8 | 92 |
| M1903 | pedestal | rifle | 5 inch | 20 | 90 |
| M1896 | pilar | rifle | 5 inch | 32 | 88 |
| Armstrong | pedestal | rifle | 4.72 inch | 34 | 86 |
| Army/Navy | pedestal | rifle | 4 inch | 4 | 84 |
| M1903 | pedestal | rifle | 3 inch | 101 | 74 |
| M1902 | pedestal | rifle | 3 inch | 60 | 72 |
| M1898 | parapet | rifle | 3 inch | 111 | 70 |