The Battle of Guadarrama (Spanish: Batalla de Guadarrama), also known as the Battle of Somosierra (Batalla de Somosierra), was a battle that occurred in the Sierra de Guadarrama during the Spanish Civil War from 22 July to 15 September 1936.
The Nationalists sent by Emilio Mola attempted to cross the mountain passes of the Sierra de Guadarrama to advance on the capital city of Madrid from the north. The Republicans sent a force of militiamen and soldiers from Madrid to stop the advance, with most of the fighting taking place at the Somosierra pass in the last week of July and in early August. The Republicans were successful at preventing the Nationalists from crossing the mountain passes and held the front at the Sierra de Guadarrama for the remainder of the war.
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