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This is one of the older PODs in the book, but it's one that actually has some potential to be explored in terms of real-world results. Assuming that Charles Martel loses the Battle of Poitiers by one or two of his liege men falling at just the wrong moment, leading to his death in a botched attempt to capture him, the result being that the Frankish army breaks up from the sudden loss of leadership that matters in a pre-modern army more than in a modern one.

Thus as a result the Battle of Poitiers winds up providing a victory for the Ummayyads instead of a defeat. What, realistically, would happen? Obviously the aversion of the Carolingian Empire is a massive sweeping set of butterflies for Europe, but would the Caliphate indefinitely raid into Western and Northern Europe? Would a victorious Tours for the Muslims wind up being instead something more like OTL Tallas, where the Muslims win a major victory on the borders but nothing much changes from it?

Or would the result instead have been somewhere in between?
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