The Battle of Schellenberg, also known as the Battle of Donauwörth, was fought on 2 July 1704 during the War of the Spanish Succession. The engagement was part of the Duke of Marlborough's campaign to save the Habsburg capital of Vienna from a threatened advance by King Louis XIV's Franco-Bavarian forces ranged in southern Germany. Marlborough had commenced his 250-mile (400 km) march from Bedburg, near Cologne, on 19 May; within five weeks he had linked his forces with those of the Margrave of Baden, before continuing on to the river Danube. Once in southern Germany, the Allies' task was to induce Max Emanuel, the Elector of Bavaria, to abandon his allegiance to Louis XIV and rejoin the Grand Alliance; but to force the issue, the Allies first needed to secure a fortified bridgehead and magazine on the Danube, through which their supplies could cross to the south of the river into the heart of the Elector's lands.