The Battle of San Lorenzo took place on February 3, 1813, during the Argentine War of Independence. It was fought between the forces of the United Provinces of the Río de la Plata, led by Juan José Viamonte, and the Spanish royalists. The battle occurred near the town of San Lorenzo, in present-day Argentina, and was significant for the independence movement. The battle is notable for the involvement of the Argentine Navy, which played a crucial role in the conflict. The victory at San Lorenzo helped to boost morale among the revolutionary forces and marked a step forward in the struggle against Spanish colonial rule in the region.