Huge population displacement during the Second World War lead women and men to living together in a exceptional context. Among them, the french prisoners of war ended up in the Reich in which remained mainly german women. Due to work and everyday life, meetings were unavoidable and people established contacts, contacts which were forbidden, but didn't happen less often. Indeed, these acts were trivial : the exchange of food, conversations, sharing of intimacy. But they were interpreted as a political danger, as an affront to the racial ideas of the Third Reich, or an a harm to german morals. This paper tries to analyse these relationships in the light of the concept of fraternisation. In this particular context, the classic pattern of the occupier/occupied is reversed : it's not the man, as victorious soldier, who imposes his domination over the mostly female population, but the conquered man, taken prisoner, who ends up « occupied » among the victorious, among the « occupier », the german women. The inverted balance of power leads to many interrogations : Which form of fraternisation are these relationships taking ? Is there necessarily an implied political aspect behind the exchanged acts between these men and women ? And eventually, do we have to talk inevitably about fraternisation for these type of relationships ?