Battle of Oriamendi
1837 CE.
Shown on the map at 43.267°, -1.967°.
The Battle of Oriamendi (Basque: Oriamendiko Gudua) was fought on 16 March 1837, during the First Carlist War, a civil war in Spain from 1833 to 1840, the first of the three Carlist Wars, fought between two factions over the succession to the throne and the nature of the Spanish monarchy. The battle was an overwhelming victory for the Carlist faction.
Text from the Wikipedia article Battle of Oriamendi, licensed CC BY-SA 4.0.