Good luck finding historical texts translated into English for that.
Yet the unfortunate thing is that if you do find sufficient resources the issues boil down the sheer nationalism - a narrow essay.
If you work smart this subject has the greatest work:scaling ratio.
I never knew the events of the Crusades, it bored me to death and I didn't have the time to waste either. I was behind the whole class in the readings but I read a few chapters of the Warren text and listened in class.