Battle of the Tonelero Pass

The Passage of the Tonelero
	Part of the Platine War
	; Brazilian warships passing the Tonelero defences
Date	17 December 1851
Location	Paraná River, Argentina33°26′01″S 60°03′28″W / 33.43361°S 60.05778°W
Result	Brazilian victory
Belligerents
Empire of Brazil	Argentine Confederation
Commanders and leaders
John Pascoe Grenfell	Lucio N. Mansilla
Strength
4 steamships; 3 corvettes; 1 brig; 60 guns	2,000; 16 guns
Casualties and losses
4 killed; 5 wounded; Corvette Dona Francisca hit by 3 cannon balls; Steamship Recife heavily damaged; Steamship Dom Afonso damaged; Brig Caliope heavily damaged	Brazilian accounts:; 8 killed; 20 wounded; ; Argentine accounts:; 1 killed

The Battle of the Tonelero Pass, also known as Passage of the Tonelero, was fought near the cliff of Acevedo, in the west bank of the Paraná River, Argentina, on 17 December 1851, between the Argentine Confederation Army commanded by Lucio Norberto Mansilla and warships of the Brazilian Imperial Navy led by John Pascoe Grenfell.

^ Diaz, Antonio. "Historia politíca y militar de las repúblicas del Plata: desde el año de 1828 hasta el de 1866, Volume 4, Part 9". Hoffman y Martinez, 1878, p.14

[1] Diaz, Antonio. "Historia politíca y militar de las repúblicas del Plata: desde el año de 1828 hasta el de 1866, Volume 4, Part 9". Hoffman y Martinez, 1878, p.14

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