Turkiye Commemorates the Canakkale (Gallipoli) Victory

[Nefer]

He close (as a Submarine Commander) the Bosporus for Ally war ships and sinks many of them! He was one of the most reason why Ally can't get Gallipoli!

Now I am a bit confused, its written that he sunk 2 pre-dreadnought class ships in May 1915, while the naval campaign was during February 1915 - March 1915. Guess they tried to slip trough during some land engagements then ? Have to read into it.