Reno
The Studio Ghibli Fanatic
German defeat was set in motion IMHO the day they signed an alliance with Austria.
Not really, Had the Italians honored their alliance (yes, i know their army was not the best of kind) with Germany and Austria-Hungary, it would have forced another front to wich the Allies would have to deploy more forces in 1914, and had the Germans not sent those corps (from one of the attack groups fighting at the Marne) to fight at Tanneberg. The German attack force (at Marne) would have been a lot stronger.
So i'd say that the Germans had a chance all along. If they had not sent reinforcements to Prussia and Italy had comed to Central Power side like the original plan was.