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The civil war that broke out with the shooting of Manuel Dorrego by order of Juan Lavalle in Buenos Aires mostly took place in Córdoba Province, where the battles of San Roque, La Tablada and Oncativo were fought.
He helped Juan Lavalle form the army with which he conducted the campaign of Entre Rios in 1840.
In October 1840, the Coalition forces in the North, under General Lamadrid invaded Córdoba from the northwest, while Juan Lavalle was heading there from Santa Fe to avoid being caught between two fronts.