gladiator did it for show, but it proves battles can be fought without armor and people can actually survive... and sometimes lead a rebelion against fully armored armies and actually win those battles...

yeah, I know you didn't talk about scavenging a whole armor... maybe I expressed myself rather confusing... let me put it in another way:

what I tried to say is even if you find a not damaged piece of armor, maybe it can't fit one's current pieces or the body at all... making scavenging rather difficult