Meanwhile, the expanding Muslim Ottoman Empire became a serious threat to Austria. The Vatican initiated a so-called Holy League against the "hereditary enemy" of Christian Europe ("Erbfeind christlichen Namens"). Far from joining or supporting the common effort of Austria, Germany and Poland, France under Louis XIV of France invaded the Spanish Netherlands in September 1683, a few days before the Battle of Vienna. While Austria was occupied with the Great Turkish War (1683–1699), France initiated the War of the Grand Alliance (1688–1697). The attempt to conquer large parts of southern Germany ultimately failed when German troops were withdrawn from the Ottoman border and moved to the region. However, following a scorched earth policy that caused a large public outcry at the time, French troops devastated large parts of the Palatinate, burning down and levelling numerous cities and towns in southern Germany.