Battle of Noáin
1521 CE.
Shown on the map at 42.758°, -1.654°.
The Battle of Noáin or the Battle of Esquiroz, fought on 30 June 1521 was the only open field battle in the Spanish conquest of Iberian Navarre. It was a decisive victory for the Spanish against the Franco-Navarrese army.
Text from the Wikipedia article Battle of Noáin, licensed CC BY-SA 4.0.