Battle of the Tonelero Pass

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.

The Passage of the Tonelero
Part of the Platine War

Brazilian warships passing the Tonelero defences
Date17 December 1851
Location
Paraná River, Argentina
33°26′01″S 60°03′28″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
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