Battle of Tours (732 AD)

The Battle of Tours (732 AD) decisively halted the Umayyad Caliphate's northward expansion from Iberia, preserving Christian dominance in Western Europe. Charles Martel's Frankish forces repelled an invasion that, if successful, could have extended Islamic rule into Gaul and Britain within a decade. This victory outperforms #2 (Battle of Marathon) in its direct impact on Europe's religious and political structure, enabling the Carolingian Empire's rise and shaping medieval feudalism. Historian Edward Gibbon credited it as the moment that saved Christendom, with the 732 AD triumph permanently limiting Islamic expansion to the Pyrenees.