April 24, 1184 B.C.: First Trojan Horse Attack

From Wired's Randy Alfred:

1184 B.C.: During the Trojan War, the Greeks depart in ships, leaving behind a large wooden horse as a victory offering. It is hauled inside the walls of Troy, and Greek soldiers descend from the horse's belly after dark to slay the guards and commence destruction of the city.

[Wired]