March-June 1937: Nationalists captured the Basque region and Bilbao, an important industrial center
Basque region was isolated, making reinforcements and communication with Madrid difficult
Basque commanders ignored central orders; Republican air force didn’t challenge Nationalist control of the skies
Bilbao's outdated and undermanned defenses fell after aerial and artillery bombardment
April 26, 1937: German Condor Legion bombed Guernica under Franco’s orders.
City was largely undefended and bombed during market day
civilian casualties at 300–1,700
Machine-gunning of fleeing civilians occurred; military targets were untouched
Debate over whether the bombing was terror or tactical; propaganda blamed Basques
Immortalized by Picasso’s painting Guernica
Madrid withstood repeated Nationalist offensives from November 1936 to January 1937
International Brigades and anarchist forces helped defend the city
Franco laid siege instead of continuing direct assaults
Became a Republican symbol
February 1937: Nationalists attempted to cut Madrid off from Valencia
Initial Nationalist success; Republicans counterattacked with reinforcements (International Brigades, Soviet tanks)
Battle ended in stalemate; both sides entrenched and suffered heavy losses (6,000–20,000 each)
March 1937: Italian CTV (50,000 troops) attacked to support Madrid encirclement
Poor tank coordination and lack of air cover led to Italian failure
Republican counterattack routed Italians, who left 6,000 casualties and equipment behind
July–November 1938: Last major Republican offensive aimed at linking Republican territories
Republicans initially succeeded but couldn’t hold Gandesa
Battle turned into war of attrition; both sides lost ~60,000 men
Nationalists’ air/artillery superiority
Republicans left too weak to continue major fighting
Territorial losses over time; final defeat in early 1939 with Madrid and Valencia surrendering
Internal divisions: Communists vs. anarchists, Stalinists vs. Trotskyists
Weak central command and lack of arms/materials
Nationalists used foreign aid (German air force, Moroccan troops) effectively
Republicans mostly on the defensive and unable to regain initiative
~500,000 deaths (mostly civilians), mass refugee crisis (~500,000 Republicans fled)
Destruction and underdevelopment delayed recovery
Seen as a prelude to WWII: air raids, ideological warfare, and combined arms tactics debuted
Strengthened fascist influence in Europe; Franco allied with Germany/Italy
War was symbolically important worldwide
seen as struggle between fascism and freedom or communism and property rights
Inspired cultural and literary works (Orwell, Hemingway, Picasso)