▁World ▁War ▁II , ▁it ▁later ▁worked ▁on ▁the ▁Atlantic ▁Wall ▁def ences , ▁and ▁a ▁range ▁of ▁infrastr ucture ▁projects ▁across ▁German - domin ated ▁Europe . ▁Ho cht ief ▁also ▁constructed ▁buildings ▁for ▁Hitler ▁himself , ▁not ably ▁his ▁Bav arian ▁Al pine ▁retre at , ▁the ▁Berg hof , ▁his ▁Wolf ' s ▁La ir ▁headquarters ▁in ▁R ast enburg , ▁and ▁the ▁F ühr erb unker ▁in ▁Berlin , ▁where ▁Hitler ▁ultimately ▁committed ▁suic ide . ▁ ▁After ▁ 1 9 3 9 ▁the ▁firm ▁began ▁to ▁use ▁forced ▁labour ▁extens ively ▁on ▁its ▁projects , ▁as ▁did ▁many ▁other ▁German ▁industrial ▁concerns ▁at ▁the ▁time . ▁Ho cht ief ' s ▁slave ▁workers ▁suffered ▁from ▁mal nut r ition , ▁be ating ▁and ▁constant ▁ab use . ▁The ▁cons ort ium - led ▁nature ▁of ▁construction ▁projects ▁obsc ures ▁the ▁firm ' s ▁exact ▁invol vement , ▁as ▁does ▁the ▁destruction ▁of ▁many ▁records . ▁ ▁During ▁the ▁closing ▁stages ▁of ▁the ▁war , ▁most ▁of ▁the ▁company ' s ▁branch ▁offices ▁were ▁destroyed , ▁and ▁employees ▁in ▁the ▁East ▁fled ▁the ▁Soviet ▁advance . ▁The ▁head ▁office ▁in ▁Ess en ▁suffered ▁a ▁direct ▁hit ▁from ▁a ▁bomb ▁in ▁March ▁ 1 9 4 5 , ▁and ▁regional ▁offices ▁and ▁construction ▁cent res ▁in ▁Dan zig , ▁Halle , ▁Kat ow ice , ▁König s berg , ▁Krak ów , ▁Leipzig ▁and ▁Mag de burg ▁were ▁lost ▁as ▁the ▁territory ▁they ▁were ▁in ▁was ▁all otted ▁to ▁Poland