Maypo (South American War of Independence).
Fought April 5, 1818, between the Chilian Patriots, 9,000 strong, under San Martin, and 6,000 Spanish Royalists, under General Osorio. The Spaniards were totally defeated with a loss of 1,000 killed and 2,350 prisoners, the Chilians losing over 1,000 killed and wounded. The result of the battle was the establishment of the independence of Chili.