The Battle of Almonacid was fought on 11 August 1809 during the Peninsular War between Sébastiani's IV Corps of the French Peninsular Army, which King Joseph of Spain had withdrawn from the Battle of Talavera to defend Madrid, and the Spanish Army of La Mancha under General Venegas. After the decisive charges of Polish uhlans, the battle resulted in a French victory.

Francisco Javier Venegas de Saavedra y Ramínez de Arenzana, 1st Marquess of Reunión and New Spain, KOC was a Spanish general in the Spanish War of Independence and later viceroy of New Spain from September 14, 1810, to March 4, 1813, during the first phase of the Mexican War of Independence.