Mortar Test Page
The first Endicott Period mortar batteries were based on experiments by Colonel Henry L. Abbot (Cullum 1632) with muzzle loading 13" mortars. Abbot configured the mortars into "quads", four mortar pits with four mortars in each pit arranged in a rectangle. The objective was to salvo the mortars so that they provided a pattern of coverage that greatly increased the probability of hitting a moving target.
As the first 12" breech loaded mortars (BLM) became available (M1886) the first batteries were constructed along the lines of Colonel Abbot's quad design. The service battery at Sandy Hook was one of the first built and because of the proximity to the proving ground at Sandy Hook the first set of set of proof firings yielded important test results. Volleys of all sixteen mortars at the same time took place on 11 Apr 1895 and yielded important results that seemed to validate his earlier experiments.
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Colonel Abbot reflected in 1896 that some 40,000 rounds of mortar ammunition were expended in perfecting the quad concept and that group control was essential to achieving perfection. He also acknowledged that the enormous expenditure of munitions required to equip a battery "(1700 tons to equip a sixteen-mortar battery with 200 rounds)" presented "troublesome engineer conditions."
Five mortar batteries were under construction at the time of the tests, all using the Abbot quad configuration and a total of seven were built with the last started in 1897. After the salvo tests it became clear to some that the servicing of sixteen mortars simultaneously in confined spaces presented challenges in terms of the numbers of people required, the efficiency of the crews in the crowded mortar pits and safety. The first change came by arranging the four mortar pits in-line all with open backs. This change was followed in most batteries constructed after 1896.
In 1906 the batteries with sixteen mortars were administratively divided into two batteries of eight mortars each (2 mortar pits). This was followed with a longer term program of physical removal of two mortars from many of the mortar pits. All of these changes combined with improved fire control improved the efficiency and accuracy of the mortar batteries. Naval armament improvements and aircraft soon rendered most coast mortar batteries obsolete because of their limited range and vulnerability to air attack. Most mortar batteries remained in service until 1942 when their value as scrap exceeded their military value.
| Fort | Original Battery | New Battery | HD | Config | Mortars | Final Mort/Carr | Start-Comp-Xfer | Stop | Rebuilt | Cement |
|---|---|---|---|---|---|---|---|---|---|---|
| Fort Preble | Battery Kearny | Battery Chase | Portland | Quad | 16/6 | M1890MI/M1896MI | 1896-1901-1901 | 1942 | Original | Both |
| Fort Banks | Battery Lincoln | Battery Kellogg | Boston | Quad | 16/12 | M1886/M1891 | 1892-1896-1896 | 1942 | Rebuilt | Rosendale/Both |
| Fort Andrews | Battery Cushing | Battery Whitman | Boston | "L" | 16/10 | M1890MI/M1890 | 1898-1904-1904 | 1942 | Remodeled | Portland |
| Fort Adams | Battery Greene | Battery Edgerton | Narragansett Bay | In Line | 16/8 | M1890MI/M1896MI | 1896-1898-1898 | 1942 | Original | Rosendale PF |
| Fort Slocum | Battery Haskin | Battery Overton | Eastern NY | Quad | 16 | M1886/M1891 | 1892-1892-1897 | 1919 | Original | Both |
| Fort Hancock | Battery McCook | Battery Reynolds | Southern NY | Quad | 16 | M1886M/M1891 | 1891-1894-1898 | 1920 | Original | Rosendale |
| Fort DuPont | Battery Rodney | Battery Best | Delaware | Quad | 16/8 | M1890MI/M1896 | 1897-1899-1900 | 1942 | Original | Both |
| Fort Monroe | Battery Anderson | Battery Ruggles | Chesapeake Bay | In Line | 16/8 | M1890MI/M1896MI | 1896-1898-1898 | 1942 | Original | Rosendale |
| Fort Moultrie | Battery Capron | Battery Butler | Charleston | Quad | 16/8 | M1890MI/M1896MI | 1897-1898-1898 | 1942 | Original | Rosendale |
| Fort MacArthur | Battery Barlow | Battery Saxton | Los Angeles | In Line | 8 | M1912/M1896MIII | 1916-1919-1919 | 1943 | Original* | Portland |
| Fort Miley | Battery Livingston | Battery Springer | San Francisco | In Line | 16/8 | M1890MI/M1896MI | 1899-1902-1902 | 1942 | Original* | Portland |
| Fort Winfield Scott | Battery Stotsenburg | Battery McKinnon | San Francisco | In Line | 16/8 | M1890MI/M1896MI | 1897-1898-1900 | 1942 | Original | Portland |
| Fort Winfield Scott | Battery Howe (1) | Battery Wagner (1) | San Francisco | Quad | 16 | M1896/M1891 | 1893-1895-1900 | 1920 | Original | Portland |
| Fort Casey | Battery Schenck | Battery Seymour | Puget Sound | In Line | 16/8 | M1890MI/M1896MI | 1898-1899-1902 | 1942 | Original | Portland |
| Fort Worden | Battery Brannan | Battery Powell | Puget Sound | In Line | 16/8 | M1890MI/M1896MI | 1899-1901-1902 | 1942 | Original | Portland |