* The Judgement of Paris: The Trojan War started because of a dispute between the goddesses Hera, Athena, and Aphrodite over who was the most beautiful. Paris, a Trojan prince, was chosen to judge. He awarded the golden apple to Aphrodite, who promised him the most beautiful woman in the world, Helen. Helen was married to Menelaus, the king of Sparta.
* The Abduction of Helen: Aphrodite fulfilled her promise, and Paris, with the help of the Trojan prince Hector, kidnapped Helen and took her to Troy.
* The Greek Response: Menelaus and his brother Agamemnon, the king of Mycenae, rallied the Greek forces to avenge Helen's abduction and reclaim her. This led to the Trojan War.
* Odysseus's Role: Odysseus, a cunning and skilled warrior, was a key figure in the Greek army. Although he had no personal desire to fight in Troy, he was obligated to serve his king and his country.
In summary, Odysseus went to Troy because he was obligated to fight for his king and country in the war against the Trojans, a war that was sparked by the abduction of Helen.