14th » Paraguay: Pedro Juan Caballero (politician) e.g Pedro Juan Caballero, Fulgencio Yegros and José Gaspar Rodríguez de Francia start actions to depose the Spanish governor
16th » Peninsular War: The allies Spain, Portugal and United Kingdom, defeat the French at the Battle of Albuera.
18th » Battle of Las Piedras (1811) e.g Battle of Las Piedras: The first great military triumph of the revolution of the Río de la Plata in Uruguay led by José Artigas.
Famous Birthdays on May in 1811
11th » Chang and Eng Bunker, Thai-American conjoined twins (d. 1874)
11th » Jean-Jacques Challet-Venel, Swiss politician (d. 1893)