Euzko Gudarostea was the name of the army commanded by the Basque Government during the Spanish Civil War. It was formed by Basque nationalists, socialists, communists, anarchists and republicans under the direction of lehendakari José Antonio Aguirre and coordinating with the army of the Second Spanish Republic. It fought the troops of Francisco Franco during 1936 and 1937. It surrendered to the Italian Corpo Truppe Volontarie at Santoña, while the rest of the Republican army kept fighting until 1939. This event is called the Santoña Agreement, Pact of Santoña, or Treason of Santoña by some Spanish leftists.
The Second Battle of the Corunna Road was a battle of the Spanish Civil War that took place from 13 December 1936 to 15 January 1937, northwest of Madrid. In December 1936, the Nationalists launched an offensive in order to cut the Corunna Road and isolate Madrid, but a Republican counter-offensive stopped the Nationalist advance. The Nationalists cut the Corunna road but failed to encircle Madrid.
The Battle of Jarama was an attempt by General Francisco Franco's Nationalists to dislodge the Republican lines along the river Jarama, just east of Madrid, during the Spanish Civil War. Elite Spanish Legionnaires and Moroccan Regulares from the Army of Africa forced back the Republican Army of the Centre, including the International Brigades, but after days of fierce fighting no breakthrough was achieved. Republican counterattacks along the captured ground likewise failed, resulting in heavy casualties to both sides.
The Battle of Santander was a battle fought in the War in the North campaign of the Spanish Civil War during the summer of 1937. Santander's fall on 26 August assured the Nationalist conquest of the province of Santander, now Cantabria. The battle devastated the Republic's "Army of the North"; 60,000 soldiers were captured by the Nationalists.
The War in the North was the campaign of the Spanish Civil War in which the Nationalist forces defeated and occupied the parts of northern Spain that had remained loyal to the Republican government.
The Aragon Offensive was an important military campaign during the Spanish Civil War, which began after the Battle of Teruel. The offensive, which ran from March 7, 1938, to April 19, 1938, smashed the Republican forces, overran Aragon, and conquered parts of Catalonia and the Levante.
The Catalonia Offensive was part of the Spanish Civil War. The Nationalist Army started the offensive on 23 December 1938 and rapidly conquered Republican-held Catalonia with Barcelona. Barcelona was captured on 26 January 1939. The Republican government headed for the French border. Thousands of people fleeing the Nationalists also crossed the frontier in the following month, to be placed in internment camps. Franco closed the border with France by 10 February 1939.
The Battle of Bilbao, part of the War in the North in the Spanish Civil War, saw the Nationalist Army capture Bilbao and the rest of the Basque Country that was still being held by the Republic.
The Isaac Puente battalion was a battalion of the Confederación Nacional del Trabajo (CNT) from the Basque Country which was active during the Spanish Civil War from September 1936 to October 1937. It was named after Isaac Puente and was nº 3 of the Milicias Antifascistas de la CNT and nº 11 of the Euzko Gudarostea. The battalion participated in the Villarreal Offensive, the Vizcaya Campaign, the Battle of Santander, the Asturias Campaign and the Battle of El Mazuco.
The Biscay Campaign was an offensive of the Spanish Civil War which lasted from 31 March to 1 July 1937. 50,000 men of the Eusko Gudarostea met 65,000 men of the insurgent forces. After heavy combats the Nationalist forces with a crushing material superiority managed to occupy the city of Bilbao and the Biscay province.
The Asturias Offensive was an offensive in Asturias during the Spanish Civil War which lasted from 1 September to 21 October 1937. 45,000 men of the Spanish Republican Army met 90,000 men of the Nationalist forces.
The Extremadura campaign was a campaign in Extremadura, Spain during the Spanish Civil War. It culminated in the Battle of Badajoz in August 1936, from which the troops of the Army of Africa under the command of Francisco Franco moved quickly to begin the march to Madrid.
The Córdoba offensive was a failed Republican offensive against the Nationalist held city of Cordoba. It took place from 19 to 22 August 1936 during the Spanish Civil War.
The Battle of Seseña was Republican-Soviet assault on the Nationalist stronghold of Seseña, near Toledo, 30 km south of Madrid in October 1936 during the Spanish Civil War. After the fall of Talavera de la Reina and Toledo in September 1936, the Nationalist troops pushed towards Madrid and in October they were 30 km from the city. The Republican government which had received new Soviet weapons decided to launch a counteroffensive in order to stop the Nationalist offensive at Seseña. The attack failed and the Nationalists resumed their advance towards Madrid. The battle is notable for being the first time that massive tank warfare was seen in the Spanish War and for the use by Nationalist troops of Molotov cocktails against Soviet T-26 tanks.
The Battle of Lopera took place between 27 and 29 December 1936 during the Spanish Civil War. This battle took place during the Nationalist's Aceituna offensive. On 27 December, the XIV International Brigade launched an attack in order to occupy the Nationalist-held town of Lopera, but the attack failed after two days and the Brigade suffered appalling casualties.
The Bombing of Durango took place on 31 March 1937, during the Spanish Civil War. On 31 March 1937 the Nationalists started their offensive against the Republican held province of Biscay. As part of the offensive the Aviazione Legionaria and the Legion Condor bombed Durango, a town of 10,000 inhabitants that was also a key road and railway junction behind the frontline. Around 250 people are believed to have died in the bombing.
The Huesca Offensive was an operation carried out during the Spanish Civil War by the Rebublican Army in June 1937 in order to take the Aragonese city of Huesca, which since the start of the war in July 1936 had been under the control of the Nationalist forces.
The Aceituna Campaign took place during the Spanish Civil War in 1936. In December 1936, the Nationalists launched an offensive in order to occupy the town of Andújar. The Nationalists occupied 2,600 square kilometres (1,000 sq mi) and defeated the Republican Army at Lopera, but failed to occupy Andújar.
The Zaragoza Offensive took place during the Spanish Civil War in 1937. This battle involved the Spanish Republican Army. The main goal of the offensive was to occupy the city of Zaragoza. The main action of the offensive was the battle of Belchite.
The Levante Offensive, launched near the end of March 1938, was an attempt by Nationalist forces under Francisco Franco to capture the Republican held city of Valencia during the Spanish Civil War. The Nationalists occupied the province of Castellón, but the offensive failed due to bad weather and the dogged resistance of the Republican troops at the XYZ defensive line.
Spanish Republic 
Euzko Gudarostea 
Isaac Puente Battalion 
Nationalist Spain 
Alberto de Montaud