The Battle of Schellenberg 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. En route, the Allies 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 Bavaria. For this purpose, Marlborough selected the town of Donauwörth. Once the French knew of the Allies' objective, they dispatched Count d'Arco with an advance force of 12,000 men from their main camp at Dillingen to strengthen and hold