Battle of Brunete
1937 CE.
Shown on the map at 40.400°, -3.983°.
The Battle of Brunete (6–25 July 1937), fought 24 kilometres (15 mi) west of Madrid, was a Republican attempt to alleviate the pressure exerted by the Nationalists on the capital and on the north during the Spanish Civil War. Although initially successful, the Republicans were forced to retreat from Brunete after Nationalist counterattacks, and suffered devastating casualties from the battle.
Text from the Wikipedia article Battle of Brunete, licensed CC BY-SA 4.0.