Canonicus-class monitor

Mahopac on the Appomattox River, 1864
Class overview
Operators	United States Navy  Peruvian Navy
Preceded by	Passaic class
Succeeded by	Miantonomoh class
In commission	1864–1898
Completed	9
Lost	3
Scrapped	6
General characteristics
Type	Monitor
Displacement	2,100 long tons (2,100 t)
Tons burthen	1,034 tons (bm)
Length	235 ft (72 m) (Canonicus, Ajax) 225 ft (69 m) (Catawba, Oneota) 224 ft (68 m) (Wyandotte) 223 ft (68 m) (Mahopac, Manhattan, Saugus, Techumseh)
Beam	43 ft 8 in (13.31 m) (Canonicus, Ajax') 43 ft 3 in (13.18 m) (Catawba, Oneota) 43 ft 5 in (13.23 m) (Wyandotte) 43 ft 4 in (13.21 m) (Mahopac, Manhattan, Saugus, Techumseh)
Draft	13 ft 6 in (4.11 m) 13 ft 3 in (4.04 m) (Wyandotte)
Installed power	4 × fire-tube boilers 320 ihp (240 kW)
Propulsion	1 × propeller 1 × vibrating-lever steam engine
Speed	8 kn (15 km/h; 9.2 mph)
Complement	100 officers and enlisted men
Armament	2 × 15-inch (381 mm) Dahlgren smoothbore guns
Armor	Gun turret: 10 in (250 mm) Waterline belt: 5 in (130 mm) Deck: 1.5 in (38 mm)

The Canonicus-class or Tippecanoe-class was a class of nine monitors built for the Union Navy during the American Civil War. An improvement on the preceding Passaics, modified in accordance with war experience, each vessel mounted two 15-inch (381 mm) Dahlgren guns. The five ships commissioned during the war participated variously in the Bermuda Hundred Campaign, the Battle of Mobile Bay and the First and Second Battles of Fort Fisher. When attacking the ironclad ram CSS Tennessee in 1865, the monitor Tecumseh was sunk by a naval mine, then termed a "torpedo". 94 died. Eight of the suspected conspirators for the assassination of Abraham Lincoln were incarcerated aboard Saugus and the monitor Montauk before they were transferred to the Arsenal Penitentiary. The remaining four ships not commissioned during the war were built on the Ohio River, three at Cincinnati, and Ajax at South Pittsburgh. Of these, Catawba and Oneota, renamed Atahualpa and Manco Cápac respectively, were sold to the Peruvian Navy and participated in the War of the Pacific, both being scuttled to prevent their capture by the Chilean Navy. The last remaining member of the class, the lead ship Canonicus, was an exhibit during the Jamestown Exposition, before being sold to the broken up in 1908.