 In 1179 a great Crusader castle was destroyed after a five day siege. Eight hundred of its garrison were killed and at least 700 enslaved. It was a catastrophe for the Crusader cause - but how did it happen? How did the great Muslim leader Saladin break into this  state of the art  fortress and defeat its fearsome Knight Templar defenders in such a short time?  Timewatch  reveals the true and savage story of  Jacob s Ford .