It was going to be by airship since it lets them show off and project power, and because they wouldn't be reliant on others (not having ships of their own, though steamships were also a long term pla for them).
First I was 😟, then 😯, then 😨.
Lacking, as I do, more than a vague grasp of the period's history, I hadn't realized Dracula was concurrent with the other events going on. Almost as surprised to see him as the Ottomans likely were at his actions.