Fair enough, it just seemed very large to me (not implausible at all, but you know how ancient writers can exaggerate these things) but apparently it is commonly accepted. Thanks.A penteres would have 300 oarsmen, 40 sailors, 60-100 marines on each ship, so crews of around 400; and the size of fleets can be fairly reliably gauged from the size of the naval bases, some of which have been excavated to show 300 slips. I think there's enough evidence that it's a good figure, and I've certainly seen very few arguments that it's too many.