Why did Agamemnon go to war with Troy?

Agamemnon went to war with Troy primarily to retrieve his brother Menelaus's wife, Helen, who had been abducted by Paris, a prince of Troy. This act was seen as a profound insult and a violation of guest-host relationships, prompting the Greek city-states, led by Agamemnon, to unite against Troy. Additionally, the war was fueled by ambitions of power and glory, as well as the desire to establish dominance over the region. The conflict eventually became legendary, culminating in the Trojan War, as described in Homer's epics.