Battle of Márquez Bridge
1829 CE.
Shown on the map at -34.660°, -58.757°.
The Battle of Márquez Bridge (located on the border between current-day Villa Udaondo and Paso del Rey, Buenos Aires Province, Argentina), fought on 26 April 1829, during the civil war between Unitarians and Federalists, resulting in a victory for the Federal Party forces of Juan Manuel de Rosas and the governor of Santa Fe Province, Estanislao López, over general Juan Lavalle, who had usurped the office of Governor of Buenos Aires Province.
Text from the Wikipedia article Battle of Márquez Bridge, licensed CC BY-SA 4.0.