Battle of the Tonelero Pass

Significance

The Battle of the Tonelero Pass was an engagement of the Platine War in which Brazilian Imperial Navy warships under John Pascoe Grenfell contested Argentine Confederation forces commanded by Lucio Norberto Mansilla near the cliff of Acevedo on the west bank of the Paraná River. Control of the Paraná passage was a strategic objective in the broader Platine War, as river access shaped the operational reach of both Brazilian and Argentine forces in the region. The engagement reflected Brazil's reliance on naval power to project force along the river systems of the Río de la Plata basin during the conflict.

Forces & casualties

Commanders (3)