Battle of Julianstown
1641 CE.
Shown on the map at 53.670°, -6.280°.
The Battle of Julianstown was fought on 27 November 1641 near Julianstown in County Louth during the Irish Rebellion of 1641. A force sent by the Dublin government to reinforce the garrison of Drogheda was ambushed by Irish rebels and nearly destroyed.
Text from the Wikipedia article Battle of Julianstown, licensed CC BY-SA 4.0.