Now that I understand your post () I know what the problem was. You never directly engage these guys. I take it that you weren't able to separate them sufficiently from their army and that they were fairly rested. VGs are the first infantry unit I engage (after missiles and cav), and I never directly engage them in less it's to tire them out.
Story time!!!
Leading an Armenian army against them I tried to get my fat, bloated general a positive valor modifier (it was like -6 or something). To do this I charged him at the catapults the Byzies stranded. Well, he is the only one in his unit that dies, even before he reached the target. Basically I had to take a slightly experienced, recently general-less army against a fresh Byzantine one.
The key, as always, is mobility. I was able to bait the VGs and draw them away from their army, spread them out, and exhaust them. You don't touch those guys. You wear them down with missiles (I had mounted x-bows) and repeatedly charged them. Eventually they broke and ran but most of the battle was a feint while I focused on the 2 crazy Norsemen units. Just remember weapon/anti-weapon, don't let them touch anything other than the tip of your lances and missiles and you'll be fine. An army (one stack) without a general won against a larger force. Oh, yes, this was on expert.
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