Battle of San Lorenzo

The Battle of San Lorenzo was fought on 3 February 1813 in San Lorenzo, Argentina, then part of the United Provinces of the Río de la Plata. A Spanish royalist force under the command of Antonio Zabala was defeated by the Regiment of Mounted Grenadiers, under the command of José de San Martín. This battle was the baptism by fire for this military unit, and for San Martín in the Spanish American wars of independence.

Montevideo, a royalist stronghold during the Argentine War of Independence, was under siege by José Gervasio Artigas. Those in the city raided population centres along the nearby rivers for supplies. San Martín, who shortly before had arrived in Buenos Aires and formed the regiment, followed the royalist ships to San Lorenzo.