Well...the barbarians now want to prove that the katana is inferior to the european sword....
The Katana is (was) not a weapon to be used on the battlefield.They used spears.
The Katana was mainly a weapon that was used by Samurai (as we all know). The Samurai was less than 3 % of the total population of Japan.
The Katana can be used with one hand if you are truly a good swordsman.
The armor of the Europeans is different than the Japanese.Thus the fighting style is different.
If i was a chillin with a barbarian and the Barbarian starts to insult me for my Katana i would perform ''Ippon-me - Mae'' to silence him.