Why did Agamemnon want to go to war with Troy?

Agamemnon wanted to go to war with Troy primarily to retrieve his brother Menelaus's wife, Helen, who had been abducted by Paris, a Trojan prince. This act was seen as a grave insult to Greek honor and required a collective response from the Greek city-states. Additionally, Agamemnon sought to assert his power and establish his dominance among the Greek leaders. The war also provided an opportunity for glory and wealth through conquest.