Pará-class monitor

A photo of Alagoas, possibly in Rio de Janeiro in the 1890s
Class overview
NamePará class
BuildersArsenal de Marinha da Côrte, Rio de Janeiro
Operators Imperial Brazilian Navy
Preceded bySilvado
Succeeded byJavary class
Built1866–1868
In service1867–1900
Completed6
Scrapped6
General characteristics
TypeRiver monitor
Displacement500 metric tons (490 long tons)
Length39 m (127 ft 11 in)
Beam8.54 m (28 ft 0 in)
Draft1.51–1.54 m (5.0–5.1 ft) (mean)
Installed power180 ihp (130 kW)
Propulsion2 shafts, 2 steam engines, 2 boilers
Speed8 knots (15 km/h; 9.2 mph)
Complement8 officers and 35 men
Armament1 × 70- or 120-pdr Whitworth gun
Armor
  • Belt: 51–102 mm (2.0–4.0 in)
  • Gun turret: 76–152 mm (3.0–6.0 in)
  • Deck: 12.7 mm (0.50 in)

The Pará-class monitors were a group of six wooden-hulled ironclad monitors named after Brazilian provinces and built in Brazil for the Imperial Brazilian Navy during the Paraguayan War in the late 1860s. The first three ships finished, Pará, Alagoas and Rio Grande, participated in the Passage of Humaitá in February 1868. Afterwards the remaining ships joined the first three and they all provided fire support for the army for the rest of the war. The ships were split between the newly formed Upper Uruguay (Portuguese: Alto Uruguai) and Mato Grosso Flotillas after the war. Alagoas was transferred to Rio de Janeiro in the 1890s and participated in the Fleet Revolt of 1893–94.