In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

During this war, a veteran of a Morocco campaign, the Count of Eu, was recalled from his honeymoon to fight for his father-in-law's side. The leader of the losing country ordered his 70-year-old mother publicly flogged and had an Irish mistress named Eliza Lynch. A boundary dispute after this war was resolved by Rutherford B. Hayes. The victorious side in this war initially named Bartolome Mitre as supreme commander, and a turning point saw the losing country's fleet destroyed at the naval battle of Riachuelo. This war ended with the death of the losing country's flamboyant leader Francisco Solano Lopez. For 10 points, name this 1864 to 1870 conflict, the bloodiest war in South American history, which saw Paraguay get defeated by Argentina, Brazil, and Uruguay.
History