The Battle of Vuelta de Obligado was part of a larger naval blockade that lasted how long?
Battle of Vuelta de Obligado:  The action was part of the larger Anglo-French blockade of the Río de la Plata. Anglo-French blockade of the Río de la Plata: The Anglo-French blockade of the Río de la Plata was a five-year-long naval blockade imposed by France and Britain on the Argentine Confederation ruled by Juan Manuel de Rosas.
i don't know