This Day in History: 0000-06-20

20 Jun – On La Noche Triste, Aztec warriors drove Spaniards under Hernan Cortez out of Tenochtitlan (Mexico City), but the smallpox epidemic that had just begun in the city decimated the populace and ensured ultimate Spanish victory (1520).
20 Jun – Hoping to capitalize on German success in the north, Italy launched a costly and unsuccessful invasion of France (1940).