Question: What river in south Central America saw a battle fought on its right bank on 19 December 1810
Sentence (from "Paraná River"): The Paraná River (Spanish: "Río Paraná" , Portuguese: "Rio Paraná" , Guarani: "Ysyry Parana" ) is a river in south Central South America, running through Brazil, Paraguay, and Argentina for some 4880 km .
Relevant evidence: Yes