Battle of Irun

Battle context

The Battle of Irún is listed in the context of the First Carlist War, though the supplied overview describes an engagement associated with a different conflict and set of commanders. Based strictly on the provided overview, the battle was the decisive engagement of the Campaign of Gipuzkoa and resulted in the capture of Irún by Nationalist forces under Alfonso Beorlegui. That capture severed the northern provinces of Gipuzkoa, Biscay, Santander, and Asturias from their supply lines and external support routed through France, with immediate operational consequences for the forces holding those provinces. By cutting this corridor, the battle isolated a substantial portion of the opposing side's territory, depriving it of arms and reinforcement at a critical stage of the wider northern campaign.