▁in ▁the ▁Wu hl he ide ▁San ator ium ▁in ▁Berlin . ▁Following ▁the ▁Naz i ▁invasion ▁of ▁Poland ▁at ▁the ▁on set ▁of ▁World ▁War ▁II , ▁he ▁served ▁as ▁combat ▁medic ▁in ▁the ▁Germany ' s ▁Polish ▁and ▁French ▁campaign s . ▁ ▁In ▁ 1 9 4 0 , ▁Stad ie ▁was ▁assigned ▁to ▁the ▁F ühr er ' s ▁headquarters ▁with ▁the ▁Action ▁T 4 ▁Naz i ▁e uth anas ia ▁administration . ▁From ▁there , ▁he ▁was ▁transferred ▁to ▁the ▁Bern burg ▁E uth anas ia ▁Centre ▁where ▁the ▁g ass ing ▁of ▁hospital ▁patients ▁took ▁place ▁in ▁the ▁fake ▁show ers . ▁Following ▁Operation ▁Bar bar ossa ▁he ▁went ▁to ▁the ▁East ▁with ▁Organisation ▁Tod t ▁tempor arily . ▁Stad ie ▁arrived ▁at ▁Tre bl ink a ▁ex termin ation ▁camp ▁in ▁July ▁ 1 9 4 2 ▁at ▁the ▁comm enc ement ▁of ▁the ▁G ross akt ion ▁Wars aw ▁resulting ▁in ▁the ▁death ▁of ▁about ▁ 2 6 5 , 0 0 0 ▁Gh etto ▁in m ates ▁prior ▁to ▁the ▁end ▁of ▁September . ▁He ▁remained ▁at ▁Tre bl ink a ▁for ▁eight ▁months ▁with ▁the ▁rank ▁of ▁Serge ant ▁Major . ▁One ▁of ▁his ▁jobs ▁was ▁to ▁meet ▁arriv ing ▁trains ▁and ▁inform ▁passengers ▁that ▁they ▁would ▁be ▁taken ▁to ▁show er ▁and ▁change ▁into ▁new ▁clothes ▁before ▁board ing ▁a ▁new ▁transport ▁to ▁their ▁work ▁destination ▁the ▁following ▁day . ▁At ▁his ▁trial , ▁Stad ie ▁said , ▁" I ▁knew ▁that