Battle of Tara Hill
1798 CE.
Shown on the map at 53.578°, -6.612°.
The Battle of Tara Hill was fought on the evening of 26 May 1798 between British forces and Irish rebels involved in the Irish Rebellion of 1798, resulting in a heavy defeat for the rebels and the end of the rebellion in County Meath.
Text from the Wikipedia article Battle of Tara Hill, licensed CC BY-SA 4.0.