Can someone tell me briefly what the Iliad poem is about?

Briefly, The Iliad is about the
Trojan War, a conflict that began when Helen, the queen of Sparta, fell in love and ran
away with Paris, a prince of Troy. Helen's husband, Menelaus, was a the brother of
Agamemnon, the powerful king of Mycenae. As high king over all the kings of other
city-states, Agamemnon was able to muster a huge navy to sail to Troy to avenge his
brother's humiliation--and gain a rich seaport if his forces won. Troy was a heavily
fortified city and had never been defeated. The Trojan people survived a ten-year seige
that ended only when the were tricked by the gift of the Trojan Horse, inside which
Greek soldiers were hiding. When the people were drunk from celebrating the apparent
retreat of the Greeks, the men who had been hiding climbed out of the horse and opened
the gates, allowing the full Greek forces inside to raze the city and kill its
inhabitants.

It's a powerful story that still entertains us
today.