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I've never been to Istanbul / Constantinople, but I guess a lot of people here are pretty knowledgeable - Byzantium being one of the favourite subjects of AH here.

I understand the Bosphorus is only about 700 m wide at some point.

Can someone please advise me:

I think I've read somewhere that at one stage someone built a bridge of boats across it. Is that true?

Also,in classical times, how would an army move from say, Constantinople to Egypt? Would it march or would it be more likely to move by ship?

I'd be grateful for any info, comments.
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