had the best swords

The adolescent in me can't stop giggling

tbf, the swords could be extremely variable. I remember one incident wherein a Celtic tribe's swords bent after some hard fighting and they had to have their comrades cover them while they tried to straighten them back out to a semi-fight-worthy condition.

Also, while blue paint was Briton, according to Caesar, tattooing and war paint more generally are attested to in literary sources (though not uncontroversially) amongst other Celtic peoples.

And helmets, so good, the Romans copied them