According to greek mythology, the battle of troy is faught when Paris is asked to give a golden apple \"to the fairest\" goddes. There were *three* goddesses, Hera, Athena, and Aphrodite. Paris Chose Aphrodite who promised him the most beautiful woman in the world, Helen, who was currently a suiter to Menelaus. Thus the start of the Trojan War(according to mythology).
Homer\'s Iliad (written centeries after the actual battle) only covers a few months out of the 10 year saga and focuses more on Achillies and Hector (I think Hector...it has been awhile).
There are also several differences between the mythology about Troy and Homer\'s Iliad. For example, in Greek Mythology, Achilies is described as being immortal except in the heel, but the Iliad describes him as being a normal human with unmatched combat skills.
In conclusion, when referencing any ancient mythology, you must understand that material may differ according depending on its source.