ORDER OF BATTLE // August 16, 1869
Victoria de paraguay
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 23,646 estimated
Paraguay
3,646
Medium-confidence figure
Empire of Brazil
20,000
Medium-confidence figure
Battle context
The Battle of Acosta Ñu, fought on 16 August 1869, was the last major engagement of the Paraguayan War between the Triple Alliance and Paraguay. By this stage of the war, Paraguay's military manpower had been so severely depleted that its force of roughly 3,600 consisted predominantly of boys aged nine to fifteen, alongside old men and wounded combatants. Facing 20,000 veteran Brazilian and Argentine soldiers under Gaston of Orleans, the Paraguayan force under Bernardino Caballero suffered casualties nearly equal to its entire strength. The engagement illustrated the terminal exhaustion of Paraguayan resistance and marked the effective end of organized military opposition, closing the active campaign phase of a war that had devastated Paraguay's population and armed forces.
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