From the article:
"In a dialogue attacking divination and astrology, Cicero tells the following story: when Marcus Crassus was about to set out on the expedition to Parthia (which was to end in his and his army's destruction), a man on the quayside was selling figs from Caunus (south Turkey) and therefore shouting Cauneas ('cow-nay-arse')! Cicero comments that Crassus should have listened to the omen and realised he was shouting cave ne eas, 'beware lest you go!', 'don't go!'
Arf arf. But there is an important linguistic point to that side-splitter. It would make no sense unless (i) ne eas were run together into neas and (ii) av and au ('ow') sounded roughly similar. And indeed they do: they both sound like au. In other words - and there is much more evidence to this effect - Latin 'v' was not pronounced like English 'v'. It was, in fact, pronounced more like a semi-vowel, e.g. English 'w' as in 'wet'. Modern Latin texts print it as 'u'."