Historedia
AmericasEvent

Battle of Las Piedras

When
1811
Where
Las Piedras
Episodes
1

The Battle of Las Piedras occurred on 18 May 1811 in the Banda Oriental. Revolutionary forces under José Gervasio Artigas defeated Spanish troops commanded by José Posadas. This victory enabled an advance towards Montevideo and is considered a crucial success for the revolution in the region.

Episodes

  1. 18 May 1811 · Las PiedrasBattle of Las Piedras

    Revolutionary forces defeated Spanish troops near Las Piedras, enabling an advance towards Montevideo.

Background and detail

Background. Following the May Revolution in 1810, Spanish forces retained control of the Banda Oriental, moving the Viceroyalty's headquarters to Montevideo. In April 1811, Artigas returned to the region with approximately 180 men provided by Buenos Aires. The conflict was part of the broader Rio de la Plata war of independence, setting the stage for engagement near Las Piedras.

Engagement. Spanish commander José Posadas established his headquarters at San Isidro Labrador de Las Piedras, intending to provoke a decisive battle. The engagement took place on 18 May 1811 near the city of Las Piedras. Revolutionary forces led by Artigas achieved a total victory against Posadas' troops, marking a significant early success for the revolutionaries in the Banda Oriental.

Consequences. The victory enabled an advance towards Montevideo, where a subsequent siege began. Historians consider this battle crucial for the survival of the revolution in Uruguay and Argentina, following earlier defeats in Paraguay and Paraná. The event is commemorated annually on 18 May, including through the 18 May 1811 Medal and local heritage sites.

People involved

  • José Gervasio Artigas · Revolutionary Leader
  • José Posadas · Spanish Commander (named as 'José Posadas' in the cited source; the given name is not independently corroborated by other supplied passages)

Sources

  1. Battle of Las Piedras (1811) Wikipedia, revision of 2026-08-21
  2. Las Piedras, Uruguay Wikipedia, revision of 2026-08-15

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.