Trojan Horse

You're probably familiar with the mythical tale of the Trojan horse, a large wooden horse made by the Greeks to win a war against the Trojans. The Greeks couldn't get into the city of Troy, and so they pretended to sail away, leaving behind this supposed parting gift. What the Trojans didn't know is that the Greeks also left a small force of soldiers inside the horse. The Trojans brought the horse into the city, and under the cover of night, the Greek soldiers exited the horse and proceeded to destroy Troy and win the war.