Most of the people around aren’t aware of other myths that give context to the Troyan War. It started from feast at Olimp where lesser deity placed at a table golden apple signed with dedication “to the most beautiful”

Three goddesses claimed the rights to it - Hera, Athena and Aphrodite. They picked a mortal moron to be the judge - that moron was Paris. Hera offered him wealth, Athena wisdom, and Aphrodite prettiest laid in the world. Paris being the moron he was picked laid and gave apple to Aphrodite.

The laid happened to be the Helen od Troy. Paris abducted her, or maybe she fell for him under Aphrodite influence and ran away with hin, doesn’t matter, this started a war.