▁languages , ▁could ▁operate ▁behind ▁enemy ▁lines , ▁w re aking ▁hav oc ▁on ▁the ▁enemy ’ s ▁command , ▁communication ▁and ▁log ist ical ▁ch ains . ▁He ▁approached ▁the ▁Reichs wehr , ▁where ▁his ▁un con vent ional ▁idea ▁was ▁rejected . ▁He ▁then ▁approached ▁the ▁commander ▁of ▁Ab wehr , ▁Admir al ▁Wilhelm ▁Can aris ▁who ▁accepted ▁Hi ppel ' s ▁idea . ▁Hi ppel ▁was ▁assigned ▁to ▁" Section ▁II ", ▁the ▁Ab wehr ▁branch ▁dealing ▁with ▁c land est ine ▁operations . ▁Since ▁the ▁project ▁was ▁top ▁secret , ▁this ▁unit ▁was ▁designated ▁" Special ▁D ut y ▁Training ▁and ▁Const ruction ▁Company " ▁( Le hr ▁und ▁Bau ▁Kom pag nie ) ▁to ▁mask ▁its ▁true ▁function . ▁ ▁World ▁War ▁II ▁The ▁unit ' s ▁first ▁operation ▁took ▁part ▁during ▁the ▁In vas ion ▁of ▁Poland . ▁By ▁mid - year , ▁small ▁teams ▁of ▁command os ▁had ▁entered ▁Poland ▁to ▁in fil tr ate ▁key ▁fact ories , ▁mines ▁and ▁power ▁stations . ▁The ▁X - Day ▁for ▁Case ▁White ▁was ▁set ▁for ▁September ▁ 1 . ▁ ▁On ▁the ▁evening ▁of ▁August ▁ 3 1 , ▁a ▁team ▁of ▁the ▁Brandenburg ers ▁in fil tr ated ▁Dan zig . ▁At ▁ 4 : 1 7 ▁local ▁time , ▁they ▁surrounded ▁and ▁attempted ▁to ▁se ize ▁the ▁city ' s ▁post ▁office . ▁Sim ult ane ously , ▁the ▁sab ote ur ▁teams ▁began ▁to ▁blow ▁up ▁their ▁target ▁facilities ▁where ▁they ▁had ▁been ,