How did Odysseus join the Trojan war?

Odysseus joined the Trojan War after being bound by an oath he had made alongside other Greek leaders to support Helen's husband, Menelaus, in recovering her after she was taken by Paris of Troy. Initially reluctant to leave his family, he feigned madness by plowing his fields with salt, but was eventually discovered when he was tricked into revealing his sanity. His cleverness and strategic mind led him to become a key figure in the Greek forces during the war. Ultimately, he played a crucial role in the Greeks' victory through his cunning and resourcefulness.