“From Speer’s office Reymann made a quick visit to one of the defense sectors on Berlin’s outskirts. Each of these inspections only served to deepen Reymann’s conviction that Berlin’s defenses were an illusion. In the strutting, triumphant years, the Nazis had never considered the possibility that one day a last stand would be made in the capital. They had built fortifications everywhere else – the Gustav Line in Italy, the Atlantic Wall along the European coast, the Sigfried Line at Germany’s western borders – but not even a trench had been built around Berlin. Not even when the Russians drove with titanic force across eastern Europe and invaded the Fatherland did Hitler and his military advisors act to fortify the city.”
Ryan, Cornelius. The Last Battle. 1966. p. 380