The Battle of Guadalajara saw the victory of the Spanish Republican Army and of the International Brigades over the Italian and Nationalist forces attempting to encircle Madrid during the Spanish Civil War. The Nationalist forces involved in the Battle of Guadalajara were primarily the Italian Corps of Volunteer Troops.
The Battle of the Ebro was the longest and largest battle of the Spanish Civil War and the greatest, in terms of manpower, logistics and material ever fought on Spanish soil. It took place between July and November 1938, with fighting mainly concentrated in two areas on the lower course of the Ebro River, the Terra Alta comarca of Catalonia, and the Auts area close to Fayón (Faió) in the lower Matarranya, Eastern Lower Aragon. These sparsely populated areas saw the largest array of armies in the war. The battle was disastrous for the Second Spanish Republic, with tens of thousands left dead or wounded and little effect on the advance of the Nationalists.
The Battle of Brunete, 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.
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 Santander was 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 a theatre of the Spanish Civil War that occurred in northern Spain from 31 March to 21 October 1937.
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 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 Spanish 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 from 1 September to 21 October 1937.
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 a 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 Segovia Offensive was a Republican diversionary offensive which took place between 31 May and 6 June 1937, during the Spanish Civil War. The main goal of the offensive was to occupy Segovia and divert Nationalist forces from their advance on Bilbao. After a brief initial advance the offensive failed due to Nationalist air superiority.
The Huesca Offensive was an operation carried out during the Spanish Civil War by the Republican 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 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 final offensive of the Spanish Civil War took place between 26 March and 1 April 1939, towards the end of the Spanish Civil War. On 5 March 1939, the Republican Army, led by Colonel Segismundo Casado and the politician Julián Besteiro, rose against the socialist prime minister Juan Negrín, and formed a military junta, the National Defence Council to negotiate a peace deal. Negrín fled to France but the communist troops around Madrid rose against the junta, starting a civil war within the civil war. Casado defeated them and started peace negotiations with the Nationalists. Francisco Franco, however, was willing to accept only an unconditional surrender. On 26 March, the Nationalists started a general offensive and by 31 March, they controlled all of Spanish territory. Hundreds of thousands of Republicans were arrested and interned in concentration camps.
Spanish Republic 
Euzko Gudarostea 
Isaac Puente Battalion 
Nationalist Spain 
Alberto de Montaud