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The Battle of Marquez 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 Lopez , over general Juan Lavalle , who had usurped the office of Governor of Buenos Aires Province.

Prelude [ edit ]

After the fall of the Bernardino Rivadavia administration, the leader of the Federalist Party, Colonel Manuel Dorrego , was elected governor of Buenos Aires Province. An alliance of the Unitarian Party with the army chiefs that had fought against the Brazilian Empire deposed Dorrego on 1 December 1828. Days after, Dorrego was defeated at the Battle of Navarro and shot by order of Lavalle.

Rosas, Buenos Aires Province chief of the army, marched to Santa Fe Province, where he joined with Santa Fe governor Estanislao Lopez starting to march on Buenos Aires, to avenge the crime and depose the Unitarian government. Lavalle anticipated and attacked Santa Fe, but Lopez had stronger forces and left Lavalle without effective cavalry and forced him to retreat. Several minor caudillos from the South of Buenos Aires Province forced the Unitarian forces to divide and fight, forcing Lavalle to retreat.

Battle [ edit ]

Lavalle wanted to stop the advance of the Federalist forces on a defensible site, selecting the Marquez Bridge, over the Conchas River (today Reconquista River ). he awaited them there with 1,000 men, veterans and well armed, against the 4,000 militiamen of Lopez and Rosas, which were accompanied by about 3,000 Indians.

On 26 April at 6 in the morning, the attack started, and slowly the Federalists dominated the course of events. A little before 10 AM, a noise charge by the Indians spooked Lavalle's horses. The Unitarian cavalry was quickly taken over, while the infantry was forced to retreat, crossing the bridge and destroying it. They then continued the retreat towards today's La Matanza Partido , while Lopez established camp in Lujan and Rosas in Canuelas .

Consequences [ edit ]

The battle left Lavalle's forces diminished and without mobility. Lopez had to return to Santa Fe, as general Jose Maria Paz had deposed Cordoba Province governor and could attack Lopez's province of Santa fe at any moment. Rosas established a siege of Lavalle at the city of Buenos Aires, closing access and leaving him without supplies from the countryside. In a few months Lavalle was forced to sign a peace accord with Rosas (see Canuelas Pact ). Rosas would soon later be elected Governor of Buenos Aires Province.

The Battle of Marquez Bridge was a Federalist victory making it possible for the Federalists to take control of the province and take the civil war against the Unitarians to the interior of the country, having the resources of Buenos Aires province, the biggest and richest, behind them. By the end of 1831 the Unitarian Party would be defeated in all the provinces of Argentina.

References [ edit ]

Bibliography [ edit ]

• Sosa de Newton, Lily (1967). Lavalle . Buenos Aires: Plus Ultra.
• Lacasa, Pedro. Vida del General Juan Lavalle . Buenos Aires.
• Newton, Jorge (1965). Estanislao Lopez, el Patriarca de la Federacion . Buenos Aires: Plus Ultra.
• Zinny, Antonio (1987). Historia de los Gobernadores de las Provincias Argentinas . Buenos Aires: Hyspamerica.
• Gianello, Leoncio (1986). Historia de Santa Fe . Buenos Aires: Plus Ultra.