In the wake of the French defeat, Dollmann's 7th Army remained in the West. Along with "Generalfeldmarschall" Erwin von Witzleben, Dollmann was the only commander of the western campaign who did not see service against the Soviet Union along the Eastern Front. Military historians suggest that the reason might be that Dollmann was considered too inflexible and technically unsuitable for the warfare in the East. For reasons that remain unknown, Dollmann began having serious doubts about the Nazi regime and where his country was headed. Dollmann did not keep up with contemporary tactical military developments nor did he follow the course of the war all that closely. Instead he became complacent, overweight, and followed the lead of his immediate superior, Field Marshal Gerd von Rundstedt, neglecting the coastal defenses of France in the process. Rundstedt believed that the best strategy was to allow the Allies to land, build up their forces, and wait for them to advance inland. The Germans could then destroy the Allies in blitzkrieg maneuvers as they attempted to make their way deeper into France. This way, the Germans would be well out of the range of Allied naval guns and could easily secure an advantage.