In the Story The Iliad, what caused the Greeks and the Trogans to got to war?

To get Helen back.

Wasn't someone's wife snatched away?

http://ancienthistory.about.com/cs/troyilium/a/trojanwar.htm

In the epic poem "The Iliad" by Homer, the primary cause of the war between the Greeks (also referred to as the Achaeans) and the Trojans is the abduction of Helen, the wife of Menelaus, the king of Sparta. The Trojan prince Paris had taken Helen to Troy, which ignited the conflict.

To find this information, you can read or study "The Iliad" itself. It is a narrative poem that recounts the events of the Trojan War, and it provides a detailed account of the Greek-Trojan conflict. You can find either a translated version or an annotated version to aid in understanding the historical and mythological context behind the war. Another source of information could be scholarly articles or books that discuss "The Iliad" and its themes. Public libraries, academic libraries, online databases, or reputable websites focusing on literature and mythology can provide valuable resources to conduct research on the topic.