Indian Oral Epics: "Mahabharata" by Krishna-Dwaipayana Vyasa
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(Original Review, 2004-06-18)
Since Homer specialised in the "in media res" scenario, which modern screenplay writers, with their enormous initial back-stories - yes Superman and Spider-Man writers I am accusing you, my friends - still seem to have no concept of) we need to recognise that Homer took for granted his audience's familiarity with the Greek myth-kitty, so they might already know why, thanks to the Judgement of Paris (don't look it up!) Hera and Athena sided with the Greeks.
If you're into stuff like this, you can read the full review.