Dave L Wrote:
-------------------------------------------------------
> "Is this a guess ? Or do you have some basis for
> it ? "
>
> Logic.
>
> They didn't have canals with locks as far as I
> know, so it was natural rivers they were using.
> You couldn't sail a boat that big upstream with a
> sail that small so something must have been
> pulling it.
>
> They may have had tracks for horses, but knowing
> the Romans, big manpower specialists, they had
> people pulling as well.
>

So it is a guess. I was hoping for an answer that relied on evidence rather than wild speculation

That is supposed to be what we do here - isn't it ?