Battle of the River Garonne
732 CE.
Shown on the map at 45.041°, -0.607°.
The Battle of the River Garonne, also known as the Battle of Bordeaux, was fought in 732 between an Umayyad army led by Abdul Rahman Al-Ghafiqi, governor of Al-Andalus, and Aquitanian forces led by Duke Odo of Aquitaine.
Text from the Wikipedia article Battle of the River Garonne, licensed CC BY-SA 4.0.