Having no cable, I was unable to watch this program. However, it is historically inaccurate to discuss the Crusades except in context of the entire history of the conflict between Islam and Christianity and its successor the West.
Islam was generally on the offensive from its inception to 1100, conquering a very large proportion of the historically Christian lands.
For a coupls of centuries after 1100 the Crusades attempted an eventually unsuccessful attempt to regain a very small portion of these lands.
From about 1300 to 1500, Islam generally gained ground against Christendom.
From 1500 till recently, Islam has generally been receding in political competitiveness, to the point that today its continued existence rests not on its own power but merely on its opponents' unwillingness to be "mean."
Change above post to:
"From about 1300 to 1650, Islam generally gained ground against Christendom."