You may be thinking of this: https://en.wikipedia.org/wiki/Umayyad_invasion_of_Gaul https://en.wikipedia.org/wiki/Umayyad_invasion_of_Gaul 8th Century. My di

You may be thinking of this: https://en.wikipedia.org/wiki/Umayyad_invasion_of_Gaul https://en.wikipedia.org/wiki/Umayyad_invasion_of_Gaul 8th Century. My distant recollection from university French courses is that the Battle of Tours, which repulsed the invasion, is among the earliest major events that the French consider directly part of their national history, and is a really big deal to them. Though of course "France" didn't really exist yet, at that time (it's telling that the "French" forces were from two independent kingdoms, both located in modern France), though enough elements were in place that you could maybe call it a kind of proto-France.