All hail, and welcome to the Doge of the Republic. Francesco and/or Guillaume will come and pay you a visit very soon.
Speaking of paying visits...
This is probably not the best evening to launch this, but I had intended to begin the crossing last Monday and the slow posting rate sort of scuppered that plan. Keep in mind, as you're writing, that the Ottoman vessels have not yet "landed" at the sea wall - and in fact, via ESP, you already know that they're about to swing south to land near Bakirkoy instead. Your characters don't know this, though, nor do they know that 2/3rds of Ishak's force is actually down hear Enkirkoy, so for the time being pretty much everyone
should be under the impression that Ottoman attack will be directed against the sea wall of the city in roughly the same way that the city fell to a crusade about a hundred years earlier.
Remember that there is no army outside the land walls (yet) and no one has any definite notion of exactly where the Russian Bey is other than "about a day's ride to the south".
Craig: the Bey is about three hour's ride from Bakirkoy right now but doesn't know that the attack is being launched since I'm assuming that Shur'tu's men caught the messenger before he could be informed. Besides, Ishak's not particularly eager to let you share in the glory.

Sur'tu would be, I'd guess, in or very near Bakirkoy at the moment.
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Comment re the "last stand" fighting retreat bottleneck. I think someone should also point out (perhaps Captain or Lochlan who have seen it before) that it won't only be the Ottoman army you'll have to worry about if the walls are breached and you're trying to get to the harbour to board a boat. Considering that there are a limited number of ships and a much larger population, you may find yourself having to vie with the locals for a seat on the ferry.

I'd have had Roos say this except he has never been in such a situation before and therefore wouldn't be aware of the panic and flight in the streets when heathens begin to rampage...