I thought Syracuse forces were forbidden to leave the island?
They are, and this is a bug.
I believe that I have identified and reproduced this error. It should be corrected with the next patch. I plan to release the next patch shortly after the new year. I have to coordinate that with Matrix, of course, but I think that they'll be able to handle it then.
Good find!
If this particular game gets corrupted any further by this error, I might be able to repair a saved game, if you happen to have one. But if nothing else untoward happens, then I suppose that it doesn't matter too much.
Thanks for reporting this! [&o]