This was a monument to a soldier who - during the Dardanelles campaign in the first World War - carried grenades weighing 276 kilo's to a huge gun when the winch to hoist them broke down. In another gallery I have a picture of the gun (you can return here). I found an interesting story that I could not check. It does not debunk the feat, but puts a funny twist to it, at Gallipoli Gossip.
NOTE: This particular monument has been replaced by another, where the man is wearing a cap but also and more importantly, where he is facing another way and carries the grenade on his back. See the next pictures. The monument is at two miles from Kilitbahir, travelling along the coast to the West.