Gott mit uns never seemed to apply so fittingly. The start of the book is a fantastic continuation of the fifth book and what is necessary to end the war. By the end of the book you realize that they are going to need a massive miracle to pull off victory. God will truly need to be with them in order to survive book 7, if they even do.
All the planning Ibarra did is about to be put to the test. If humanity is still there to vilify him in book 8 then he truly has done something right.