ORDER OF BATTLE // April 26, 1829
Battle of Márquez Bridge
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 8,000 estimated
Federalist
7,000
Medium-confidence figure
Unitarian
1,000
Medium-confidence figure
Battle context
The Battle of Márquez Bridge was fought on 26 April 1829 during the ongoing civil conflict between Unitarian and Federalist factions in Argentina. Federal forces under Juan Manuel de Rosas and Estanislao López, governor of Santa Fe Province, defeated a Unitarian force commanded by Juan Lavalle, who had seized the governorship of Buenos Aires Province by usurpation. The Federalist numerical advantage was decisive, with 7,000 troops against Lavalle's 1,000. The victory weakened Lavalle's political and military position and reinforced Federalist dominance in the Buenos Aires region, advancing Rosas's consolidation of power in what would become one of the defining struggles of the Argentine Civil Wars.
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