Rubuta ci gaba don wannan sakin layi - 'Yan Brazil sun keta kariya ta kogi a Curupaity a cikin hasken rana a ranar 15 ga Agusta 1867 tare da "Barroso", "Tamanadaré", da wasu jiragen ruwa guda takwas. An buga jiragen ruwa sau 256, amma ba a lalace sosai ba, kuma kawai sun mutu 10 da 22 suka ji rauni. Sun sake maimaita aikin a ranar 9 ga Satumba. A ranar 19 ga Fabrairun 1868 jiragen ruwa shida na Brazil, ciki har da "Barroso", sun wuce Humaitá
da dare. Masu lura da kogin uku,, kuma an ɗaure su zuwa manyan ironclads idan har wani injin ya kashe ta hanyar bindigogi na Paraguay. "Barroso" ya jagoranci tare da "Rio Grande", sannan "Bahia" tare da "Alagoas" da "Tamandaré" tare da "Pará". "Barroso" ya ci gaba da hawan sama tare da sauran jiragen ruwa da ba a lalace ba kuma sun harbe Asunción a ranar 24 ga Fabrairu. A ranar 23 ga Maris "Rio Grande" da "Barroso" sun nutsar da jirgin ruwa "Igurey" kuma sojojin Paraguay sun shiga jiragen ruwa biyu a yammacin ranar 9 ga Yuli, kodayake sun yi nasarar korar masu shiga.