Battle of Irún
1936 CE.
Shown on the map at 43.333°, -1.783°.
The Battle of Irún was the critical battle of the Campaign of Gipuzkoa prior to the War in the North, during the Spanish Civil War. The Nationalist Army, under Alfonso Beorlegui, captured the city of Irún cutting off the northern provinces of Gipuzkoa, Biscay, Santander, and Asturias from their source of arms and support in France.
Text from the Wikipedia article Battle of Irún, licensed CC BY-SA 4.0.