The Greeks built a gigantic wooden horse, left it outside the gates of Troy, and then their fleet sailed away. Unbeknownst to the Trojans, Greek soldiers were hidden inside the horse. The Trojans, believing it to be an offering, brought it into their city and reveled at their supposed victory over the Greeks. While the Trojans slept, the Greek fleet had returned and the soldiers inside the horse opened up the city gates. Caught by surprise, the Trojans were all slain and the city of Troy was laid to ruin.