Campaign of Gipuzkoa

The campaign of Gipuzkoa was part of the Spanish Civil War, where the Nationalist Army conquered the northern province of Gipuzkoa, held by the Republic.
Background.
In late July Mola´s troops suffered a shortage of ammunition (having only 26,000 rounds of ammunition). Then Francisco Franco sent him large supplies of ammunition and weapons from Italy and Germany via Portugal (600,000 rounds). On August 13, Mola met Franco in Seville and decided to capture San Sebastián and Irún in order to cut the Basques off from the French Border at the western end of the Pyrenees.
The campaign.
Advance on San Sebastian.
The campaign was initially conceived by General Emilio Mola as an advance to Irún, to cut the northern provinces off from France, and to link up with the Nationalist garrison in San Sebastián that was to have seized that city. The campaign was diverted from the advance on Irún when the direct route to the town was blocked by the demolition of the bridge at Endarlatsa. When word came that the Nationalists in San Sebastián were besieged in the Cuartel de Loyola, Alfonso Beorlegui diverted all his forces westward toward that town in an attempt to relieve the Nationalist garrison. Two other Nationalist columns advanced on the city from points further west with the intent of cutting it off from Biscay. Nevertheless, on 27 July, the Nationalist garrison in San Sebastián surrendered.
Advance on Irun.
Following the failure to relieve the siege of the Nationalists in San Sebastian, the forces of Beorlegui resumed their advance on Irún to cut off the northern provinces of Gipuzkoa, Biscay, Santander and Asturias, from their source of arms and support in France by taking that city. On August 11 the Nationalists took Tolosa and Beorlegi seized Picoqueta, a key ridge commanding the approach to Irún. Telesforo Monzon, a Basque Nationalist, travelled to Barcelona to seek aid, but he only got 1,000 rifles, and the Basque nationalists confiscated the gold in the local branch of the Bank of Spain to buy weapons in France, but on August 8 the French government closed the frontier.
On August 17, the rebel battleship "España", the cruiser "Almirante Cervera" and the destroyer "Velasco" arrived at San Sebastián and started to shell the city. After that, German Ju 52 bombers and other Italian planes bombarded on a daily basis the bordering towns of Hondarribia and Irun, as well as San Sebastián. Furthermore, the Nationalists captured the republican commander in Gipuzkoa, Pérez Garmendia.
Fall of Irun and San Sebastián.
On August 26, Beorlegi began the assault on Irún. The poorly armed and untrained leftist and Basque nationalist militias fought bravely but could not fend off the rebel push. After bloody combats, the resisting forces were overwhelmed: thousands of civilians and militia-men fled in panic across the French border on September 3, 1936. The town was occupied that day. Beorlegui was wounded, and died a month later.
Enraged by their lack of ammunition, retreating anarchists burned parts the city. The Nationalists followed this up with the capture of San Sebastián on September 13. The dying General Beorlegi could still preside over the parade of triumphant far-right rebel troops entering the city with no fighting.
A sizable number of the city's 80,000 inhabitants fled on an exodus towards Biscay. British field-journalist George L. Steer sets the figure of the terrified population fleeing to Bilbao at 30,000. Basque Nationalist Party officials arranged for the final orderly evacuation of the city before its fall, holding back the anarchists, small in number, who were planning to wreak havoc.
Despite their evacuation, 485 were killed at the city as a result of pseudo-trials mounted by the Spanish rebel troops in the aftermath of the city's occupation up to 1943, but during the first months of occupation approximately 600 were murdered in "paseos" (extrajudicial executions). Among them, Steer cites the execution of seventeen priests of Basque nationalist sympathies. The city mayor also faced summary execution.
The Nationalist rebels advanced further west. They were stopped by the Republicans at Buruntza for a few days, but continued their push until the outer fringes of Biscay (Intxorta). There, the resistance of the Basque pro-republican forces, backed up with 8,000 rifles smuggled "in extremis" by Lezo Urreiztieta to Santander on 24 September, and the exhaustion of the Nationalists resulted in an end of the offensive until the War in the North began.
Aftermath.
The Nationalists conquered 1,000 square miles of terrain and many factories. Furthermore, they cut off the Basques from sympathetic France. Then, Indalecio Prieto, the Republican minister of defense sent the Republican fleet to the northern ports in order to prevent a rebel blockade. On occupation during September, a "Comisión Gestora" or Management Commission was appointed by the rebels comprising the factions involved in the military insurrection, i.e. Carlists, Falangists, and others. The "Junta Carlista", the Carlist high executive body in the province, was then chaired during the first months by the local Carlist leader Antonio Arrúe Zarauz up to early 1937.
After taking over San Sebastián, speaking in the Basque language was frowned upon, and then forbidden by proclamation. Occupation was followed by harsh repression against inconvenient figures and individuals. Among them, the Basque clergy were specifically targeted and exposed to torture and rapid execution for their family ties and/or proximity to Basque nationalist proponents and ideas. In general, they were searched according to blacklists put together in Pamplona. Despite occasional internal protests within the ecclesiastic hierarchy, they did not go far. A widespread purge of the clergy in Gipuzkoa was decided in the high military and ecclesiastic circles. The occupiers also purged the Provincial Council ("Diputación/Aldundia") resulting in the expulsion 1,051 civil servants and workforce, 123 of them railway operators.
The hatred underlying the crackdown was evidenced by the assassination of José Ariztimuño 'Aitzol' (priest and major personality of the Basque cultural renaissance during the previous years), tortured and shot on 18 October in the Hernani cemetery along with other ecclesiastic and civilian victims found fleeing.