Ooh, camels... Can't wait for more...
And don't worry about those Mongols, they won't have a clue what hit them, they'll say "Hang on, I thought we were the horde here?" Also, you do know how hard western europe will be to take on? Gothic knights in heavy armour vs Camel Warriors with no armour + the penalty for camels in lush terrain... Hmm. Not to mention that your petty camel archers won't do a thing when their arrows bounce off that inch thick steel.

Oh, I haven't played vanilla for a while, does the HRE even produce gothic knights? I guess not because of all the requirements.