In 1840 a revolt against the dictatorial rule of Juan Manuel de Rosas began in the interior of Argentina. Brigadier Juan Lavalle assembled about 4,000 men, mostly from Corrientes Province but with some exiles from Buenos Aires Province. He invaded Entre Ríos Province with this force. He fought a Federal army of about 5,000 men under the command of the Governor, Brigadier Pascual Echagüe at the Battle of Don Cristóbal (10 April 1840) and the Battle of Sauce Grande (16 July 1840).