Siege of Dieppe
1442 CE.
Shown on the map at 49.922°, 1.078°.
The siege of Dieppe (2 November 1442 – 14 August 1443) took place during the Hundred Years War where English forces led by John Talbot, Earl of Shrewsbury besieged and failed to capture the French-held port of Dieppe in Normandy.
Text from the Wikipedia article Siege of Dieppe, licensed CC BY-SA 4.0.