The Battle of St. Jakob an der Birs was fought between the Old Swiss Confederacy and French (mostly Armagnac) mercenaries, on the banks of the river Birs. The battle took place on 26 August 1444 and was part of the Old Zürich War. The site of the battle was near Münchenstein, Switzerland, just above 1 km outside the city walls of Basel, today within Basel's St-Alban district.