Question: Mexican general, Gregorio Ruiz, fought against the ensuing empire of the younger brother of the Austrian emperor Francis Joseph I, the only what of the Second Mexican Empire?
Sentence (from "Second Mexican Empire"): The Mexican Empire (Spanish: "Imperio Mexicano" ) or Second Mexican Empire (Spanish: "Segundo Imperio Mexicano" ) was the name of Mexico under a limited hereditary monarchy declared by the Assembly of Notables on July 10, 1863, during the Second French intervention in Mexico.
Relevant evidence: No