Paz then participated, along with his brother, in the battles of Vilcapugio, Ayohuma, Puesto del Marquéz and in Venta y Media in which his arm was wounded and crippled; hence he became known as the "One-arm Paz" ("El Manco Paz"). In 1814, Supreme Director Juan Martín de Pueyrredón put him in front of the "Dragoons of the Nation" ("Dragones de la Nación") battalions, and named him Coronel.