Siege of Drogheda
1649 CE.
Shown on the map at 53.714°, -6.350°.
The Siege of Drogheda, 3 to 11 September 1649, took place at the start of the Cromwellian conquest of Ireland. The port of Drogheda was held by a mixed garrison of Irish Catholics and Royalists under the command of Sir Arthur Aston, when it was besieged by English Commonwealth forces under Oliver Cromwell. After Aston rejected an invitation to surrender, the town was stormed and much of the garrison executed, along with an unknown but "significant number" of civilians. Its aftermath is viewed as an atrocity which still impacts Cromwell's modern reputation.
Text from the Wikipedia article Siege of Drogheda, licensed CC BY-SA 4.0.