▁He ▁was ▁arrested ▁on ▁ 3 0 ▁April ▁ 1 9 4 2 ▁and ▁in car cer ated ▁in ▁M ø ll erg ata ▁ 1 9 ▁until ▁ 2 2 ▁May ▁ 1 9 4 3 , ▁then ▁in ▁Gr ini ▁concentration ▁camp ▁until ▁ 2 9 ▁July ▁ 1 9 4 3 . ▁He ▁was ▁then ▁transferred ▁to ▁Germany ▁and ▁was ▁imprison ed ▁in ▁H eg er w elde ▁and ▁Sachsen hausen ▁until ▁January ▁ 1 9 4 4 , ▁then ▁Maj dan ek ▁and ▁Lub lin ▁before ▁being ▁in ▁Bir ken au / A usch witz ▁from ▁ 2 9 ▁July ▁ 1 9 4 4 ▁to ▁ 1 8 ▁January ▁ 1 9 4 5 . ▁He ▁was ▁then ▁imprison ed ▁in ▁M auth aus en , ▁Mel k ▁and ▁D ach au ▁before ▁being ▁liber ated . ▁By ▁war ' s ▁end , ▁he ▁and ▁thousands ▁of ▁other ▁prisoners ▁were ▁forced ▁to ▁march ▁west ward ▁in ▁front ▁of ▁the ▁Soviet ▁thrust ▁forward . ▁He ▁was ▁res cu ed ▁from ▁imprison ment ▁by ▁the ▁operation ▁undert aken ▁by ▁the ▁Swedish ▁Red ▁Cross ▁and ▁the ▁Dan ish ▁government ▁in ▁the ▁spring ▁of ▁ 1 9 4 5 ▁referred ▁to ▁as ▁the ▁White ▁B uses ▁( H v ite ▁bus ser ), ▁which ▁brought ▁home ▁several ▁thousand ▁prisoners ▁from ▁former ▁concentration ▁cam ps . ▁ ▁Post - war ▁years ▁In ▁ 1 9 4 5 ▁he ▁wrote ▁the ▁book ▁Men ▁no en ▁kom ▁fra ▁det ▁to ▁document ▁his ▁experiences ▁in ▁Naz