Best time/scenario for Greece to gain straits and coast?

So I am thinking about writing a small alternate history book on "Greater Greece" following some individuals and events that lead up to it, similar in style to What if the Allies had Fallen?.

So I wanted to ask you guys when you think Greece could have gained control of Constantinople and the Aegean Coast on the Turkish side and had it recognized by the major powers? Extra points for Cyprus and any other territories.
 
As far as I know, the aftermath of WWI and the Greco-Turkish War after that was by far the single best time for Greece to extract territorial concessions from Turkey/Ottomans. They had an occupation zone in Izmir as per the Treaty of Serves and they have the Western Allies to back them up. However, the ensuing war with Ataturk's Grand National Assembly turned for the worst for them at Battle of Sakarya, held up at the river by the Turks. After which, it's downhill for Megali Hellas.

Greco-Turkish_War_Map.png


Simply having them break through would allow them to reach Ankara, which might give the Greeks an upper hand at forcing Serves on them. Even better, have it as a crushing blow (army routed and/or Ataturk is wounded or killed), and the GNA would be more desperate to sue for peace.
 
Just butterfly away the Dichasmos and/or King Constantine and have Greece get into the WWI in 1915. The Dichasmos conflict between the royalists and the liberals caused the schism in the Greek society that did not allow a solid front against the Turks, while (with the return of Constantine in 1920 gave the French and Italians an excuse to stop supporting Greece. At the same time Dichasmos caused quarrels inside the army and hugely burdened Greece economically.
 
That's still not giving them Constantinople (per the OP). No Turkish government is going to be willing to give that away completely. Ataturk certainly isn't secure enough to give away Constantinople and retain power, and he knows it.

I also question the likelihood of a WWI-era army successfully breaking through and capturing/killing the enemy commander; worst case he has to retreat and suffers serious losses, but the Turks can still afford those better than the Greeks can. They might be able to hold Smyrna, but they probably lose it in round two sometime later in the century (and there will definitely be a round two if the Greeks still hold Izmir). They can do better with islands and Thrace (e.g. Edirne/Adrianopolis), but a Greek enclave in Anatolia or control of Istanbul is not sustainable.
 
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