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For the 8-inch siege mortar at a range of 800 yards, about 50% of the shells would fall within a 50-yard radius of the target. With the 10-inch siege mortars at 875 yards, about 60% of the shells would fall within a 40-yard radius of the target. The 13-inch seacoast mortar could be expected to be more accurate. (Abbot 1867, p. 39)
These heavy guns were intended to be mounted in seacoast fortifications. 8-inch, 10-inch, 13-inch, 15-inch, and 20-inch bore (20, 25, 33, 38, and 51 cm) Rodman guns were produced. Other than size, the guns were all nearly identical in design, with a curving bottle shape, a large flat cascabels , and ratchets or sockets for the elevating mechanism.
10-inch seacoast mortar M. 1841 United States: 1841 260: 26 cm Minenwerfer M 17 Austria-Hungary: World War I 320: 320 mm Type 98 mortar Japan: World War II: 325: Mortier de 12 Gribeauval Kingdom of France: 1781 330: 13-inch seacoast mortar M. 1861 United States: 1861 914: Little David United States: World War II: 914: Mallet's Mortar United ...
Union battery with 13-inch (330 mm) seacoast mortars, Model 1861, during siege of Yorktown, Virginia 1862. McClellan had not given up hope of turning Yorktown. The commander of the York River flotilla, Missroon, had consistently refused to even approach the Yorktown batteries, citing the weakness of his ship.
USS John Griffith was a mortar schooner acquired by the Union Navy during the American Civil War.She was used for various purposes, but especially for bombardment because of her large 13-inch mortar and 12-pounder howitzers that could fire up and over tall defensive riverbanks.
Siege and coastal mortars ranged from 8-inch models which could accompany an army's siege train to massive 13-inch monsters which had to be disassembled and carried by rail or ship to travel any distance. The Coehorn mortar however was a type of small mortar light enough
3 seacoast 13-inch mortars 3,400 yd (3,100 m) Rain squalls on the ninth prevented action, but all was ready for the Federals by April 10, and the newly appointed Commander of the department, Major-General David Hunter, sent a demand for "immediate surrender and restoration of Fort Pulaski to the authority and possession of the United States."
Federal Battery# 4 with 13-inch (330 mm) seacoast mortars, Model 1861, during the siege of Yorktown, Virginia, 1862 Movements and battles in the 1862 Peninsula Campaign, up through the start of the Battle of Seven Pines