ORDER OF BATTLE // September 25, 1812
Battle of Tucumán
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 4,800 estimated
United Provinces
1,800
Medium-confidence figure
Viceroyalty of Peru
3,000
Medium-confidence figure
Battle context
The Battle of Tucumán on 24–25 September 1812 halted the royalist advance into Argentina's northwest, where General Juan Pío de Tristán's force of roughly 3,000 outnumbered Manuel Belgrano's Army of the North by nearly two to one. Belgrano's defeat of Tristán prevented the Viceroyalty of Peru from pushing deeper into the United Provinces and secured a critical buffer in the interior. Together with the subsequent victory at Salta in February 1813, Tucumán allowed the United Provinces to reaffirm and consolidate the borders under their control, stabilizing the northwestern front during a formative period of the Argentine War of Independence.
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