Battle of Gerberoy
1435 CE.
Shown on the map at 49.535°, 1.851°.
The Battle of Gerberoy was fought in 1435 between French and English forces. The French were led by La Hire and Jean Poton de Xaintrailles, who were victorious. The English losses were heavy, which later included their commander, John FitzAlan, 14th Earl of Arundel.
Text from the Wikipedia article Battle of Gerberoy, licensed CC BY-SA 4.0.