What was the Aragon Offensive?
The Aragon Offensive was the Nationalist attack launched on 7 March 1938, barely two weeks after the Republican defeat at Teruel. Franco's armies broke through the exhausted Republican front in Aragon, swept east across the Ebro valley and on 15 April reached the Mediterranean at Vinaròs, cutting Republican Spain in two. The offensive ended on 19 April, by the reckoning of the Virtual Spanish Civil War, and the Republic never fully recovered.1
The Virtual Spanish Civil War project calls the Aragon Offensive hugely successful for Franco and an almost mortal blow to the Republic, one from which it never completely recovered. In six weeks the Nationalists advanced from the Aragon front to the sea and left Catalonia isolated from Madrid and Valencia.2
Who won the Aragon Offensive and why?
Franco's Nationalists won. They struck an exhausted Republican army only weeks after Teruel, with overwhelming superiority in men, guns and above all aircraft, and broke the front first south and then north of the Ebro. Rojo's reserves came too late and too weak to hold, and on 15 April the Nationalists reached the sea at Vinaròs.3
Background: after Teruel
By 1938 the war had become one of attrition. The Republic had spent the winter fighting for Teruel, an offensive that Vicente Rojo planned to forestall a Nationalist attack on Madrid. Its army took the town in January 1938, when the Nationalist garrison under Colonel Rey d'Harcourt surrendered, but a Nationalist counteroffensive directed by General Fidel Dávila won the battle of the Alfambra in February, and the Republicans abandoned Teruel around 20 to 22 February.4
On the Aragon front the Republican troops were exhausted; many had never seen battle, half had no weapons, and the Nationalists now had clear control of the air. The Republican command expected Franco to return to his old plan of attacking Madrid through Guadalajara, and believed his troops were as worn out as its own. They were wrong.5
Commanders and their decisions
The first decision was Franco's. Teruel had made him drop his plan for a new attack on Madrid, and its outcome left him in so strong a position that, as the historian David Solar puts it, he changed plans and threw his forces toward the Mediterranean. The Enciclopèdia Catalana writes that he took back the initiative without losing time, while the Republican command still expected him to return to Madrid.6
Franco gave the direction of the offensive to Dávila, who had led the counterattack at Teruel. Both the Enciclopèdia Catalana and García de Gabiola describe a plan in phases: first south of the Ebro toward the Guadalope, then north of the river toward the Segre, and finally on to the Mediterranean. The spearheads included Juan Yagüe's Moroccan Corps, García Valiño's troops, Aranda's Corps of Galicia, the Corps of Navarre and Aragon, and the Italian Corpo Truppe Volontarie.7
On the Republican side the plan of defense belonged to the chief of the general staff, Vicente Rojo, the architect of the Teruel offensive. According to the lawyer and writer Javier García de Gabiola in Muy Interesante, Rojo had pulled three of his nine army corps out of the line to rebuild them or hold them in reserve for Madrid. The front in Aragon was held by the Army of the East.8
Rojo knew how weak his army was. In words quoted by the historian Antonio Gascón, he later admitted that his army corps were corps in name only, short of at least 30 percent of their men and 40 percent of their weapons. García de Gabiola notes that in the Nationalist attack the Republic faced a true Iberian blitzkrieg, and Público describes the same combination of bombers, tanks and infantry tearing the Republican lines apart in under a month.9
The strengths are given very differently. García de Gabiola sets 22 Nationalist divisions, about 220,000 men with some 400 aircraft, against 13 Republican divisions, about 100,000, with about 250. The Enciclopèdia Catalana counts the force that opened the attack at about 100,000 men with 1,000 aircraft, 200 tanks and 150 guns, against some 34,000 Republicans with 75 guns on the front first struck; Público gives a similar balance, about 100,000 Nationalists against some 35,000 poorly armed men of the Army of the East, for the attack north of the Ebro. All agree on overwhelming Nationalist superiority in men, guns and above all aircraft.10
The battle in phases
The front gives way. The offensive opened on 7 March just south of the Ebro, where the Nationalist superiority was greatest. According to García de Gabiola, Yagüe's Moroccan Corps, García Valiño's troops and the Italian CTV, nine divisions in all, fell on three Republican divisions spread thin along a wide front; after a bombardment by some 470 guns the line collapsed. Belchite, the ruined town the Republicans had stormed the summer before, was lost within days, and the British Battalion of the International Brigades was forced into a fighting retreat through Belchite, Lecera, Vinaceite and Caspe, which fell in mid-March.11
The Martín and the Guadalope. Rojo threw his reserves at the gap, first on the Martín river and then on the Guadalope, where, according to García de Gabiola, the Nationalists, an Italian motorized column at their head, reached Alcañiz on 14 March. The Enciclopèdia Catalana describes him concentrating the International Brigades at Caspe in a defense that the Nationalist air force made impossible. The sources differ on the fall of Caspe: the International Brigade Memorial Trust has the town given up on 15 March, the Enciclopèdia Catalana has Nationalist troops occupying it on 17 March.12
North of the Ebro. Then, on the night of 22 March, Yagüe crossed to the north bank of the Ebro at Quinto, and the corps of Navarre and Aragon attacked between Huesca and Zaragoza. The front north of the river broke too, and a Republican division was cut off in a pocket in the Pyrenees at Bielsa. Many Republican soldiers fought bravely, the worn-down International Brigades above all, but there was also mass desertion, and Nationalist speed and air power kept breaking every new line.13
Lleida and Gandesa. By the end of March the Nationalists had crossed the Cinca and taken Monzón and Fraga, and Yagüe's troops entered Catalonia. On 3 or 4 April they took Lleida, which El Campesino's men had tried to defend; the same day, south of the Ebro, the 1st Navarre Division, García de Gabiola writes, took Gandesa behind the Republican line. The British Battalion, reduced to about eighty men after being caught by Italian tanks it mistook for Republican ones, fell back through Gandesa and over the Ebro at Cherta, where many soldiers trapped on the wrong bank were captured or drowned trying to swim the river.14
In the first days of April the Nationalists also took Balaguer and Tremp in the Pyrenean foothills, and with them most of the hydroelectric plants that supplied Barcelona and Catalan industry with power.15
Turning point: Vinaròs
Farther south, General Aranda's troops took Morella and broke the last Republican line toward the coast. On Good Friday, 15 April 1938, Carlist soldiers of the 1st and 4th Navarre Divisions, García de Gabiola writes, reached the Mediterranean at Vinaròs after more than five weeks of fighting.16 › 15 April in military history
On Good Friday 1938 the Nationalists reached the sea, and Republican Spain was cut in two.
Losses
No full count of the dead exists. García de Gabiola puts the Republic's losses in the offensive at about 60,000. A 2024 study for the Generalitat de Catalunya, which traces the Republican dead of the Aragon front, cites the war communiqués of the Nationalist units in the southern sector alone: between 22 March and 8 April they claimed 3,486 Republican soldiers killed and 3,003 taken prisoner. Neither source gives a figure for Nationalist losses.17
Civilians died too. The Italian raids on Barcelona from 16 to 18 March killed 979 people according to the historian Laia Gallego Vila, more than 1,000 according to the Virtual Spanish Civil War and about 1,200 according to Público, which puts the wounded at more than 2,000.18
Aftermath: a Republic cut in two
The offensive was accompanied by heavy air raids on towns in Valencia and Catalonia meant to terrorize civilians. The defeat also shook the government of Juan Negrín: the defense minister Indalecio Prieto, believing the war lost, left the cabinet, and resentment of Communist power in the Popular Army began to split the Republicans. General Pozas lost the command of the Army of the East, which passed to Colonel Juan Perea.19
The Republic answered with what it had left. The French government of Léon Blum, as both the Enciclopèdia Catalana and García de Gabiola note, reopened the frontier to the Soviet arms waiting there. Rojo regrouped the troops cut off in Catalonia, and new conscripts were called up; García de Gabiola writes that Franco's hesitation gave the Republicans just enough time to patch the front together.20
Franco's choice: Catalonia or Valencia
If Franco had marched straight on Catalonia, the Virtual Spanish Civil War notes, he could have taken it easily, since few Republican troops stood in his way; the Enciclopèdia Catalana agrees that Catalonia seemed about to fall when he stopped. Instead he halted his troops on the Segre and turned south against Valencia, a longer and harder road, in a decision that has been much criticized since.21
Why Franco turned south is still argued. German troops had marched into Austria on 12 March, and Hitler annexed it the next day. García de Gabiola thinks Franco, more a political leader than a pure soldier, feared that some twenty divisions marching toward the Pyrenees might provoke France into the war; he also mentions authors who believe Franco wanted to prolong the war to strengthen his own position. In his view it was a mistaken decision, though a somewhat justified one.22
The attack on Valencia, through the mountains of the Maestrazgo, met stiff Republican resistance and failed to break the defense lines before the city. Meanwhile the Republicans regrouped in Catalonia, and in July Rojo struck back across the Ebro.23
The Republic survived another year, but its territory was now split in two, Valencia was cut off from Catalonia, and it never regained the initiative.24 › Catalonia Offensive, 1938 to 1939
One Republican division did not give up. Cut off against the French frontier in the high Pyrenees, the 43rd Division of Antonio Beltrán, known as El Esquinazao, evacuated the civilians of the valley to France and held the pocket of Bielsa from April into June 1938, and the prime minister, Juan Negrín, visited it. On 16 June, under heavy storms, it withdrew over the mountain passes into France.25
Legacy and memory
The offensive left one of the most haunting memorials of the war. Belchite, fought over in the summer of 1937 and retaken in March 1938, was never rebuilt: Franco had the ruins left as they were, as a symbol of the war, and a new Belchite was built beside them, BBC Mundo reports, with the labor of Republican prisoners. The ruins of the old town have since become a place of memory for a war that, in the words of its mayor, set brothers against brothers.26
Visiting today
The Pueblo Viejo of Belchite lies about 40 kilometers south of Zaragoza. The site was opened to guided tours in 2013, and in 2025 the World Monuments Fund put it on its Watch list of endangered heritage, warning that many of its Mudéjar churches and towers could collapse within twenty years. BBC Mundo reports some 38,000 visitors in 2024.27
