The Duke of Caxias was one of the winning sides' commanders, while the initial supreme commander was President (*) Bartolome Mitre.
One country in this war was forced to use many children as soldiers in a battle where they were killed by the Count d'Eu's men. The region known as "Presidente Hayes" is named for Rutherford B. Hayes, who helped arbitrate a dispute after this war took place. One leader in this war died at the Battle of Cerro Cora, although his mistress Eliza Lynch survived. The Duke of Caxias was one of the winning sides' commanders, while the initial supreme commander was President (*) Bartolome Mitre. This war featured the key naval battle of Riachuelo. It resulted in the loss of about 60% of the population of the country ruled by Francisco Solano Lopez. For 10 points, name this South American war in which Paraguay lost to a coalition of Argentina, Brazil, and Uruguay.
One country in this war was forced to use many children as soldiers in a battle where they were killed by the Count d'Eu's men.
War of the Triple Alliance [prompt on the Paraguyan War]