The Trojan war was a conflict between the kingdoms of Troy and Mycenaean Greece straddleshe (History.com) section 1 http://www.history.com/topics/ancient-history/trojan-war
How did it start : The war began after the abduction (or elopement) of Queen Helen of Sparta by the Trojan prince Paris. (History.com) section 2 http://www.history.com/topics/ancient-history/trojan-war
How did it end : The Trojan War ended when the Greeks defeated Troy using a large wooden horse. The hollow wooden horse helped the Greeks gain entry inside the city walls of Troy.
The major players in the Trojan war were Ajax, Andromache, Cassandra,Clytemnestra, hector, Hecuba, and Helen