But the Germans found themselves fighting on German soil anyway.
Facts look a bit shaky.
They did it in 1812 and again in 1941. They didn't do that. But then, if Germany had given a twopenny damn about the wellbeing of Austria, they would have supported Austria in Galicia so that the Austrians could concentrate on getting a nice conclusive little victory over Serbia instead of letting them in for a thumping defeat in Galicia. This would have been a victory for Germany. The Saar maybe although unlikely in view of the total failure of Plan XVII but Dortmund is some 200 miles north of Metz and on the other side of the Rhine.