Battle of Irún

Battle context

The Battle of Irún was the decisive engagement of the Campaign of Gipuzkoa and a strategic turning point preceding the War in the North. By capturing Irún, Nationalist forces under Alfonso Beorlegui severed the northern Republican-held provinces — Gipuzkoa, Biscay, Santander, and Asturias — from their supply lines and material support through France. This isolation transformed the northern zone into an enclave cut off from external reinforcement, fundamentally compromising the Republican position there and setting the conditions for the subsequent Nationalist campaign to reduce the north. Republican forces under Antonio Ortega were unable to hold the city despite comparable numbers, with Emilio Mola and Rafael García Valiño also among the Nationalist commanders directing the operation.