Sparta Military
Sparta Military was filled with the best fighting men in my opinion, one of the greatest armies in ancient history. Not because maybe there weapons were better, but these men fighting as children were transformed into fighting machines. At about the age of 14, the children would be given nothing but underwear (was called thong). They would then have to survive in the wild until they had killed a certain animal and brought it back to the city for them to accept them back.