Well the idea was to intimidate the enemy, and some guys called Gaesatae used a kind of drugs to not feel anything but aggression towards enemies as well...
It should be noted that the guys in your picture are making up for lack of ordinary soldiering means by going naked: they hope it'll unnerve the enemy. (It is a sign of confidence and in contradiction with all common sense after all.)
The Gaesatae don't quite lack any ordinary soldiering skills or what but they still go naked for the unnerving.
In other words: they just want to show off.
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