The Central Powers did win a massive victory at the battle of Caporetto in Oct-Nov, 1917, when the Germans sent reinforcements to bolster the Austro-Hungarians, a move opposed by Ludendorff but ordered by Hindenburg. The attack brought them out of the mountains and onto the Venetian plain, to within about 20 miles of Venice. But then the Germans withdrew their forces to the Western Front, in preparation for their spring offensive of 1918, leaving the Austrians unable to follow up the Caporetto victory.
As it turned out, Ludendorff had been right all along... the war wasn't going to be decided in Italy, and so the whole Caporetto effort was pointless from a military standpoint. But maybe Hindenburg thought the Austrians needed a victory for political reasons, as their empire was on the verge of collapse.
But yes, the mountain scenery is breathtaking.