Las Heras crosses the Andes with an army to join San Martín and liberate Chile from Spain.

Grand Marshal Juan Gregorio de las Heras, born on July 11, 1780, and passing on February 15, 1866, was a towering figure in South American history. This distinguished Argentine soldier not only played a pivotal role in the tumultuous Spanish American wars of independence, securing freedom for several nations, but also later served as a significant political leader, holding the governorship of the strategically vital Province of Buenos Aires.

Heras’s military career began early in the independence movement. He joined the patriot forces and quickly rose through the ranks due to his strategic acumen and unwavering bravery. He is most renowned for his instrumental involvement in the Army of the Andes (Ejército de los Andes), the formidable force led by General José de San Martín. Heras commanded the vanguard during the daring crossing of the Andes mountains in 1817, a logistical marvel that remains one of the greatest military feats in history. His division was crucial in the decisive Battle of Chacabuco (February 12, 1817), which led to the liberation of Chile. He continued to distinguish himself in subsequent campaigns, including the pivotal Battle of Maipú (April 5, 1818), which definitively secured Chilean independence. His contributions extended beyond Chile, as he also participated in the liberating expedition to Peru, where his leadership was again vital.

The prestigious title of Grand Marshal was bestowed upon Juan Gregorio de las Heras by the Peruvian Congress in recognition of his extraordinary service and sacrifice in the liberation of Peru. This supreme military rank, reserved for the most distinguished military leaders, underscored his significant impact on the continent’s independence from Spanish rule, cementing his legacy as a true hero of the Americas.

Following his illustrious military career, Heras transitioned into a crucial political role. He served as the Governor of the Province of Buenos Aires from 1824 to 1826. This period was marked by significant national developments, including the convocation of the General Constituent Congress (1824-1827), which aimed to establish a national constitution for the nascent United Provinces of the Río de la Plata. During his governorship, Buenos Aires also faced the outbreak of the Cisplatine War (or War of Brazil) in 1825, a conflict over the Banda Oriental (modern-day Uruguay). Heras navigated these complex political and military challenges, contributing to the early institutional organization of the Argentine state amidst a period of considerable instability and debate over the nation's future direction.

Frequently Asked Questions about Juan Gregorio de las Heras

When and where was Juan Gregorio de las Heras born?
Juan Gregorio de las Heras was born on July 11, 1780, in Buenos Aires, which was then part of the Spanish Viceroyalty of the Río de la Plata and is now the capital of Argentina.
What was Heras's most significant military contribution?
His most significant military contribution was his pivotal role in General San Martín's Army of the Andes, particularly his leadership during the crossing of the Andes and his command in key battles like Chacabuco and Maipú, which secured the independence of Chile.
Why was he called "Grand Marshal"?
He was awarded the title of Grand Marshal by the Peruvian Congress as a high honor, acknowledging his distinguished military service and crucial contributions to the liberation of Peru from Spanish rule.
What was Heras's role after the wars of independence?
After the wars, Juan Gregorio de las Heras served as the Governor of the Province of Buenos Aires from 1824 to 1826, a period marked by significant political and national organizational challenges in Argentina, including the start of the Cisplatine War.