Hitler at the time, that Barbarossa rests in a mountain in Germany awaiting the moment to emerge and save Germany from certain defeat and to establish German ascendancy. Bataillon (Btl.) – battalion Bataillonsadjutant – battalion adjutant Bataillonsarzt – battalion physician Bataillonsführer – substitute battalion commander Bataillonskommandeur – battalion commander Bataillonsveterinär – battalion veterinarian Batterie (Bttr.) – battery, artillery piece; also used for an electrical battery. sometimes also called Akkumulator, abbreviated as Akku. Batteriechef – battery commander Batterieführer – substitute battery commander Batterieoffizier – gun position officer Baubelehrung – vessel familiarization; when a boat or ship crew studied the construction of a new vessel; see "KLA." Baubeschreibung – general arrangement drawing sheet, giving basic dimensions and other measurement & physical parameters (materials, dihedral angles, etc.), of either German front line; or Beute/"captured" Allied aircraft, in World War I. The same term was used in the Third Reich era for more comprehensive, multi-page technical document works for factory proposals concerning combat aircraft designs to the RLM and Luftwaffe. Baupionier – army construction engineer. B-Dienst – Beobachtungsdienst, literally, "observation service"; German Navy cryptanalytical department. BDM Bund Deutscher Mädel – League of German Girls, the girls' segment of the Hitler Youth. B. d. U. – Befehlshaber der U-Boote – Commander-in-Chief of the U-boats (Admiral Karl Dönitz); see FdU. Befehl (pl. Befehle) – order, command. "Zu Befehl!" was an affirmative phrase on par with "Jawohl". Befehlshaber – commander-in-chief; lit. "one who has (the power to issue) commands." Sometimes also used to refer to the headquarters of a C-in-C as an alternative to Hauptquartier. Benzin – gasoline, petrol. Benzintank – fuel tank. Beobachter – artillery or air observer Beobachtungsoffizier – Artillery observer Beobachtungswagen – observation or reconnaissance vehicle. Bereitschaft – readiness. Bergepanzer – armoured recovery vehicle. Berlin radar – most advanced airborne intercept radar of the WW II Luftwaffe in 1944–45, based on captured cavity magnetron technology, operated on SHF-band 3.3 GHz frequency Beschlagschmied – blacksmith; see Hufbeschlagschmied. Betriebstoff – fuel. Beutepanzer – captured tank or armoured vehicle. Bewährungseinheit – probationary unit. BK – Bordkanone. heavy-calibre (usually over 30 mm) cannon for offensive use on aircraft. Blasen – U-boat order; "Blow the tanks!" Blechkoller – "tin fright"; in U-boats, a form of nervous tension that could be caused by depth charge attacks and resulted in violence or hysteria. Blechkrawatte – "tin necktie," slang for the Knight's Cross Blitzkrieg – "lightning war"; not a widely used German