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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)
Federal battery with 13-inch seacoast mortars, Model 1861, during siege of Yorktown, Virginia 1862. More featured pictures
Albrecht Mortar German Empire: World War I 254: 10-inch siege mortar M. 1841 United States: 1841 254: 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 ...
13-inch: Mortar: 13: 54.5: 17,120: 200 bell: 4,200/45° Some naval guns served ashore as siege artillery. Moreover, many guns mounted on the boats of the Mississippi River Squadron were in fact Army field artillery and siege guns. **Converted smoothbore
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The fort was still incomplete in 1861 when the Battle of Fort Sumter occurred from April 12 to 13, ... Two 10-inch (250 mm) seacoast mortars
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.
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.