Ah, got it - http://www.ucc.ie/celt/published/L201040/index.html My Latin is worse than my Irish, but I think the relevant passage is Sed et de rege Cruithniorum, qui Echodius Laib vocitabatur, quemadmodum victus, currui insidens evaserit, similiter Sanctus prophetizavit. Still, it's a bit of a leap from one of the Lives saying that a Pictish king, as the Saint had foretold, escaped in a chariot (or something like) to saying that this was a battle fought with chariots... it's funny how when you start digging deep, a lot of history is a game of Chinese whispers.
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