Not much.
There was a good reason why the Turks were not expecting the British to attack through the Bosophorus; there was absolutely no point in doing so.
teg
Would have to disagree. To have the peninsula occupied and allied naval forces in the Sea of Mamara would have been a huge diplomatic and moral blow for the pro-German element of the Ottoman government. It might have led to them being overthrown by more pro-allied elements looking for a quick peace deal.
Also control of the region would leave Constantinople very exposed, both to attack and blockade. It is also likely to make Bulgaria and Greece consider joining the war on the allied side. Given that the empire was totally isolated from the other two central powers at the time it would have been very vulnerable to pressure to make peace or lose a lot.
Steve
Greece's King wanted no part of belonging to the Entente and wasn't the King of Bulgaria a Hohzollern?
Just make them growing a brain and not start attacking the area months before the attack giving time to the Ottoman to reinforce the area and they can have a better start.
Giving them decent minesweepers would not hurt either ...
BlairWitch749
Greece's king was dubious about the idea but the PM, Venizelos and a lot of the public were in favour of war with their traditional enemy. OTL it nearly came to Greek intervention but that was delayed until 1917. TTL with the Turks on the ropes the Greeks will want to make some gains and the 70K troops Venizelos was offering are likely to be available.
I believe you're thinking about the Rumanian king. he managed to keep Rumania neutral until his death in 1916.
Steve