The Austrian commander-in-chief, Generalissimo Archduke Charles, Duke of Teschen detached Kollowrat's III Armeekorps from the main army to guard Bohemia. Later, Charles directed his subordinate to threaten Napoleon's long and vulnerable supply line which followed the Danube valley. Accordingly, Kollowrat descended upon the Linz bridgehead, but the presence of a strong defending force thwarted his plans. The action was fought during the War of the Fifth Coalition, part of the Napoleonic Wars. Urfahr is part of the modern city of Linz, on the north bank of the Danube.