In summer 1943 , he enlisted in the Soviet army and was sent to officers ' training school .
For the next two years , Lewin worked as a collective farm worker and as a blast furnace operator in a metallurgical factory .
In summer 1943 , Lewin enlisted in the Soviet army and was sent to officers ' training school .
For the next two years , Lewin worked as a collective farm worker and as a blast furnace operator in a metallurgical factory .