Germania is the western thrust of the Eurasian steppe, making its inhabitants desperate to prevent continuous encirclement, something Corporal Hitler implicitly understood as the Second World War sought to vanquish tactical trends that animated war planners from the First World War.
Dr. Christopher B. Krebs, professor of Classics at Stamford University writes A Most Dangerous Book: Tacitius' Germania from the Roman Empire to the Third Reich explores the synoptic advance Germanic geography had on previous civilizations.
Rome Lost Battle of Teutoburg http://en.wikipedia.org/wiki/Battle_of_the_Teutoburg_Forest
PresentDay Roman Remains (limes) Germania http://en.wikipedia.org/wiki/Limes_Germanicus
Stamford Pagehttps://classics.stanford.edu/people/christopher-b-krebs
Amazonhttp://www.amazon.com/Most-Dangerous-Book-Tacituss-Germania/dp/0393342921/ref=la_B004EW22FG_1_1?s=books&ie=UTF8&qid=1432053087&sr=1-1