The Naval <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Battle_of_the_Riachuelo" id="mwvA" rel="mw:WikiLink" title="Battle of the Riachuelo">Battle of the Riachuelo</a> is fought on the rivulet Riachuelo (<a href="https://en.wikipedia.org/wiki/Argentina" id="mwvQ" rel="mw:WikiLink" title="Argentina">Argentina</a>), between the <a href="https://en.wikipedia.org/wiki/Paraguayan_Navy" id="mwvg" rel="mw:WikiLink" title="Paraguayan Navy">Paraguayan Navy</a> on one side and the <a href="https://en.wikipedia.org/wiki/Brazilian_Navy" id="mwvw" rel="mw:WikiLink" title="Brazilian Navy">Brazilian Navy</a> on the other. The Brazilian victory was crucial for the later success of the <a href="https://en.wikipedia.org/wiki/Treaty_of_the_Triple_Alliance" id="mwwA" rel="mw:WikiLink" title="Treaty of the Triple Alliance">Triple Alliance</a> (<a href="https://en.wikipedia.org/wiki/Brazil" id="mwwQ" rel="mw:WikiLink" title="Brazil">Brazil</a>, <a href="https://en.wikipedia.org/wiki/Uruguay" id="mwwg" rel="mw:WikiLink" title="Uruguay">Uruguay</a>, and <a href="https://en.wikipedia.org/wiki/Argentina" id="mwww" rel="mw:WikiLink" title="Argentina">Argentina</a>) in the <a href="https://en.wikipedia.org/wiki/Paraguayan_War" id="mwxA" rel="mw:WikiLink" title="Paraguayan War">Paraguayan War</a>.