There are many reports of vigilante groups forming across Germany.
It will not be pretty, and will not end well for the invaders.
I believe there are about 9 million German men between the ages of 16 and 36. Probably a million are Muslim, and there are a million more new Muslim migrants, mostly young men, and more coming before Germany wakes up.
Those numbers don’t actually look so bad for a warlike people, facing a mostly pacified one.