 Nyorai mberi kweiyi ndima - Musi waMay 2, 1866, akapinda muhondo yeEstero Bellaco, kuderera kwenzvimbo iyo mvura yeRwizi rweParaná inosangana nemvura yeRwizi rweParaguay, uko muvengi akatanga kunonoka mauto akabatana, achitsvaga nzvimbo iri nani yekurwa. Musi wa 24 Chivabvu 1866, aive aripo paHondo yeTuyutí, kurwa kukuru muSouth America, kwaakatamba basa rakakosha mukuraira pakati peuto remauto eBrazil kurwisa kurwisa kweParaguayan. Akanyora paChirevo cheZuva 56 kuti: Kubwinya ndiwo mubayiro unokosha zvikurusa wavakashinga. Pana 15 July 1866, vachiri muTuyuti, vavakidzani vakamirira kusvika kwemauto aGeneral Count wePorto Alegre, apo muvengi akarova zuva nezuva. Akakuvadzwa zvakakomba muhondo uye asina kugutsikana nenguva yakareba yeuto rakamira, Osório akapfuudza kutungamira kwemauto eBrazil kuna General Polidoro da Fonseca Quintanilha Jordão. 