Siege of Pontoise
1441 CE.
Shown on the map at 49.052°, 2.102°.
The siege of Pontoise (6 June – 19 September 1441) took place during the Hundred Years War. French forces led by King Charles VII of France besieged and captured the last English stronghold in Île de France, eliminating the English threat to Paris.
Text from the Wikipedia article Siege of Pontoise, licensed CC BY-SA 4.0.