Answer
The Paraguayan War, also known as the War of the Triple Alliance, marked the end of Caxias' illustrious military career. This conflict, which lasted from 1864 to 1870, pitted Paraguay against a formidable alliance of Brazil, Argentina, and Uruguay. Caxias, renowned for his strategic prowess, played a pivotal role as the commander-in-chief of the Allied forces, leading them to decisive victories and ultimately securing victory in the war.