Dear Chris,
On the site you gave us concerning the invasion(s) of the Sea People, in Fig. 1, you all can view one educated view of all of the possible invasion routes of these people.
Thus;
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0020232Please compare these routes to those taken by the known Crusader invasions, etc.
They look quite similar to me.
Regards,
Ron