Between Dune and Dune Messiah, Paul Maud-Dib's Fremen armies swept across the galaxy in a bloody Jihad.
What I don't understand is who this Jihad was raged against. The key Harkonnen leaders were all dead, House Atreides was aligned with House Corrino through the wedding of Paul to Irulan.
So who was it that the Jihad was raged against, and why did the Fremen commit such a bloody atrocity? What about their religion and culture demanded such a war (as I understand it the Lisan-al-Gaib prophesy and Liet's vision for Arakkis did not necessitate galactic war)?
I am not interested in answers from the Dune movie.