The War in the North, in the Spanish Civil War was the campaign in which the Nationalist forces defeated and occupied the parts of northern Spain that remained loyal to the Republican government. The campaign included several separate battles. The Biscay Campaign resulted in the loss of the part of the Basque Country still held by the Republic and Bilbao, the greatest Spanish industrial center. This part of the campaign saw the Bombing of Guernica and Durango. The Battle of Santander caused the loss of the province of Santander in Cantabrian Castile for the Republic. The Battle of El Mazuco lead to the capture of the Republican-controlled part of Asturias and the fall of Gijón, the Republic's last stronghold in the North, to the Nationalists. The campaign ended on October 21, 1937 with a d