if the greeks had any sense they would have had constantinople back for over 80 years now; after the collapse of the ottoman empire it was pretty much a done deal between the allies and greeks that they would get the the ottoman territory on their side of the bosporus; but the greeks decided that wasn't enough and decided to invade, which went well until the turks had recovered from what was happening and totally annihilated the greek forces whose overextension stretched their economy to a breaking point

you've really got to know what your objectives are before going to war and you've got to set them according to your resources