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POD Tours is a draw and there continues to be an Arabic threat to France. This means no expansion into Germany in whoever's in Charlemagne's place.
Then a century and a half later the still pagan Germans and Scandinavians and the Arabs on the other hand crush the Frankish kingdom like the stuffing in a Twinkie.
Now the Arabs and Norse fight for the spoils.
Who wins and under what circumstances?
What side does the remaining Frankish power structures side with. The pagans they can convert in time (so they believe?) or their fellow monotheists?
Where would I find more info on Arabic armies of the time.