I'm sorry but there is no real way for lightly armed and armoured troops to deal with heavily armoured on the same terms. If you have to fight against a guy with a substantial mail armour backed with padding or a segmented or plate armour you will normally lose. By the way that was one of the reasons our forefathers wore such armour which was not very comfortable most of the times.
Of course you can hack and slash and stab at unprotected areas or deliver heavy (and therefore slow!) blows against the plate. But be sure you have one, two or three aides at hand who hold the armoured man to hinder him to hack and slash and stab at your (greater) unprotected areas at the same time. Otherwise you can still succeed but chances are with the armoured man. If you have a big shield and a helmet the difference is smaller but still exists.
Interesting discussions about arms and armour are found f.e. on http://www.romanarmy.com/rat/, http://www.myarmoury.com/talk/index.php or http://forums.swordforum.com/.
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