Christians vs Muslims
D Day the great crusade
Hitler
Civil War
Get an army, move it out of a settlement so it is on the game map. Right click on the general (you may have to have a family member leading the army) and there will be a small button towards the bottom that says "join crusade." Click that, and if you have a big enough army they will join the Crusade.
In the context of World War 2 resistance groups resisted the Nazis.
Allies vs. Axis
Jews
Cookie Monster and Elmo!!
The Arabs and the Israelis.
Retake Jerusalem
none
British children