Service Pará-class_monitor

a painting of passagem showing pará-class monitor lashed 1 of bigger ironclads

the first 3 ships finished, pará, alagoas , rio grande, participated in passagem de humaitá on 19 february 1868. engagement 3 river monitors lashed larger ironclads in case engines disabled paraguayan guns. barroso led rio grande, followed bahia alagoas , tamandaré pará. both alagoas, had taken estimated 200 hits, , pará had beached after passing fortress prevent them sinking. alagoas under repair @ são josé cerrito until mid-march, although pará joined squadron capture town of laureles on 27 february. rio grande continued upstream other undamaged ships , bombarded asunción on 24 february little effect. on 23 march rio grande , barroso sank parguayan steamer igurey , both ships boarded paraguayan soldiers on evening of 9 july, although managed repel boarders.

for rest of war river monitors bombarded paraguayan positions , artillery batteries in support of army, notably @ angostura, timbó , along tebicuary , manduvirá rivers. after war ships divided between newly formed upper uruguay , mato grosso flotillas. alagoas transferred rio de janeiro in 1890s , participated in fleet revolt of 1893–94. ships disposed of during last 2 decades of 19th century, although rio grande docked reconstruction in 1899. however, work never completed , scrapped in 1907.