Impression questions

[Tarbicus]

Well, 'relied on' might be a bit to strong a term to have used, but I think the reference to centuriones silvering their helmets to make them identifiable comes from Polybius.

I think Virgil mentions officer crest mounts being silvered or gilded, and reaching across the bowl, to distinguish them from the men who also wore crests. No mention of the helmet being silvered, though, only the crest.
[url:q3rxnmws]http://books.google.com/books?pg=PA208&lpg=PA208&dq=&id=dgYMAAAAYAAJ&output=text[/url]