Battle of Arlabán
1811 CE.
Shown on the map at 42.975°, -2.575°.
The Battle of Arlabán, also known as the First Surprise of Arlabán, took place at the heights of Arlabán, the mountain pass that separates the Basque provinces of Guipúzcoa and Álava, on 25 May 1811, during the Peninsular War.
Text from the Wikipedia article Battle of Arlabán (1811), licensed CC BY-SA 4.0.