The Trojan War began when Zeus wanted to depopulate the earth and saw the war as an opportunity. The war was sparked when Paris chose Aphrodite's gift of the most beautiful woman, Helen, who was already married to Menelaus. When Paris took Helen to Troy, it prompted Menelaus and other Greek leaders like Odysseus and Achilles to lay siege to Troy for nine years. Eventually, Odysseus devised a plan using a large hollow wooden horse that allowed the Greeks to infiltrate and sack the city, ending the long war.