Reality is becoming more and more real.
What would you do if you were a ranking politician in this region? How would you deal with this?
Exploit technology, first thing. Every German household likely has one or more cell phones. Create a government app for informing the whereabouts of migrants.
Creation of a new German federal immigration police modelled on ICE. Second to it manpower drawn from the German armed forces, and possibly NATO forces. Begin the round-ups and deportations. Draw real time intelligence from the civilian downloaded smart phone app as migrant location reports flood in. Arrange transport by large ship with a warm water port held member of the EU such as Italy. Load rounded-up migrants up on trains, ship them to the warm water port, and then literally ship them back to wherever they originated.
Never allow in over 1 million culturally incompatible migrants again.