The date of the Trojan War is fixed by internal references in the Iliad, and by the archaeology, to the 9th c BC, not the 13th.
http://www.freerepublic.com/focus/chat/1202723/posts?page=6#6
http://www.freerepublic.com/focus/news/1623102/posts?page=11#11
http://www.varchive.org/dag/cevil.htm
http://www.varchive.org/dag/index.htm
Lots of opinions to the contrary if you google the subject.