The Corps of Volunteer Troops was a Fascist Italian expeditionary force of military volunteers, which was sent to Spain to support the Nationalist forces under General Francisco Franco against the Spanish Republic during the Spanish Civil War, 1936–39.
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 Belchite refers to a series of military operations that took place between 24 August and 7 September 1937, in and around the town of Belchite, in Aragon during the Spanish Civil War, as part of a much bigger offensive to take Zaragoza, that continued until beginning of November 1937. Since the Offensive of Zaragoza failed, for propaganda reasons, the Republicans started calling it Battle of Belchite instead, so it looked like a victory, the journalists that came to report the victory, including Ernest Hemingway, contributed to this change of names. The Nationalists continued the confusion, since they exploited the "Numantine" defense of the town for propaganda too, to counteract the bad image of the bombing of Guernica.
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 Siege of Madrid was a two-and-a-half-year siege of the Republican-controlled Spanish capital city of Madrid by the Nationalist armies, under General Francisco Franco, during the Spanish Civil War (1936–1939). The city, besieged from October 1936, fell to the Nationalist armies on 28 March 1939. The Battle of Madrid in November 1936 saw the most intense fighting in and around the city when the Nationalists made their most determined attempt to take the Republican capital.
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 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 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 XI International Brigade fought for the Spanish Second Republic in the Spanish Civil War.
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 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 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 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 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.
Second Spanish Republic 
Nationalist Spain 