Yeah but I like to be as accurate as possible! This is an Earth setting after all.

You should have seen the old RP that I ran once set in the first crusade. I dug up the old treatise that dictated the rights and protections of Christians under the rule of Muslim kingdoms, the names of the commanders and important figures on both sides of the battle, the entire timeline of the war and details about the sieges of Antioch and Acre and the conquest of Jerusalem by the Fatimid dynasty of Egypt from the Seljuk Turks just before the Christian armies arrived. The details of the relief army from egypt, how the battle played out historically, and...
A lot more. 

The least I can do here is get the right time of year. :B