 Complete the following phrase:  The Pará-class monitors were a group of six wooden-hulled ironclad monitors named after Brazilian states and built in Brazil for the Brazilian Navy during the Paraguayan War in the late 1860s. The first three ships finished, , and , participated in the Passagem de 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  and Mato Grosso Flotillas after the war. Alagoas was transferred to Rio de Janeiro in the 1890s and participated in the 