Argentine War of Independence: José de San Martín and the Mounted Grenadiers Regiment defeated Spanish royalist forces in the Battle of San Lorenzo (depicted).

The Argentine War of Independence was a secessionist civil war fought from 1810 to 1818 by Argentine patriotic forces under Manuel Belgrano, Juan José Castelli, Martin Miguel de Guemes and José de San Martín against royalist forces loyal to the Spanish crown. On July 9, 1816, an assembly met in San Miguel de Tucumán, declaring independence with provisions for a national constitution.

José Francisco de San Martín y Matorras, nicknamed "the Liberator of Argentina, Chile and Peru", was an Argentine general and the primary leader of the southern and central parts of South America's successful struggle for independence from the Spanish Empire who served as the Protector of Peru. Born in Yapeyú, Corrientes, in modern-day Argentina, he left the Viceroyalty of the Río de la Plata at the early age of seven to study in Málaga, Spain.

The Regiment of Mounted Grenadiers "General San Martín" is the name of two Argentine Army regiments of two different time periods: a historic regiment that operated from 1812 to 1826, and a modern cavalry unit that was organized in 1903.

The royalists were the people of Hispanic America and Europeans that fought to preserve the integrity of the Spanish monarchy during the Spanish American wars of independence.

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. The royalist troops were composed of militiamen recruited in Montevideo under the command of militia captain Antonio Zabala, who were 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, as well as for San Martín in the Spanish American wars of independence.