The assault on the warships "Lima Barros" and "Cabral" was a naval action that took place in the early hours of 2 March 1868, when Paraguayan canoes, joined two by two, disguised with branches and manned by 50 soldiers each, approached the ironclads "Lima Barros" and "Cabral". The Imperial Fleet, which had already achieved the Passage of Humaitá, was anchored in the Paraguay river, before the Taji stronghold near Humaitá.