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 Teruel was fought in and around the city of Teruel during the Spanish Civil War between December 1937 and February 1938, during the worst Spanish winter in 20 years. The battle was one of the bloodiest actions of the war, with the city changing hands several times by first falling to the Republicans and eventually being retaken by the Nationalists. In the course of the fighting, Teruel was subjected to heavy artillery and aerial bombardment. In the two-month battle, both factions together took 110,000 casualties.
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.
José Solchaga Zala was a Spanish general who fought for the Nationalists in the Spanish Civil War.
The XII International Brigade was mustered on 7 November 1936 at Albacete, Spain. It was formerly named the Garibaldi Brigade, after the most famous and inspiring leader in the Italian Independence Wars, General Giuseppe Garibaldi.
The XYZ Line, also known as the Matallana Line, was a system of fortifications built in 1938 during the Spanish Civil War to defend Valencia, the capital of the Second Spanish Republic. The XYZ Line was a simple system of trenches and bunkers, built to withstand heavy artillery or 450-kilogram (992 lb) aerial bombs, and took advantage of some of the most difficult terrain in Spain in the Iberian System ranges to the north and northeast of Valencia. The XYZ Line was successful at halting the Nationalist advance on Valencia, being one of the last Republican victories of the war, and allowed the Republicans to start the Battle of the Ebro.
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 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 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 Battle of Alfambra took place near Alfambra from 5 to 8 February 1938, during the Spanish Civil War, and was a part of the Battle of Teruel. After the conquest of Teruel by the Republican army, the Nationalists started a counteroffensive in order to reocuppy Teruel. On 5 February, a huge Nationalist force broke the republican lines north of Teruel towards the Alfambra River, took 7,000 republican prisoners and threatened the Republican forces in Teruel.
The Battle of Caspe took place during the Aragon Offensive of the Spanish Civil War in 16–17 March 1938.
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 
International Brigades 
Nationalist Spain