Oh Yes,
Europe was vulnerable multiple times in OTL, from 600 - 1750 CE, simply from the existing Islamic forces
Most of the Obvious PODs have been mentioned already
(and that's not counting PODs based on their alliances with France and other nominally Christian countries at various times)
How far they could have gone from any of those PODs , that's much more difficult to work out.
Europe was vulnerable multiple times in OTL, from 600 - 1750 CE, simply from the existing Islamic forces
Most of the Obvious PODs have been mentioned already
- Anatolia & Byzantium in the 630s
- Hispana & Septimamia 711 (and effectively threatening to finish Christianity through to 1300)
- Ummayid raids into what is now France up to battles at Toulouse 721 and Tours 732
all the way through to the Balkans after the fall of Constantinople - Mohacs 1526
- Vienna 1529
and then seaborne culminating - Malta 1565
- Lepanto 1571
and then versus the Hapsburgs on land again - Vienna 1683
- Zenta 1697
- Eugene of Savoys campaigns in 1716-17
(and that's not counting PODs based on their alliances with France and other nominally Christian countries at various times)
How far they could have gone from any of those PODs , that's much more difficult to work out.
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