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[P.o.d.: The Ottomans defeat the Greek Navy but lose the 1st Balkan War [probably with Gallipoli, more islands and Anatolia in Greek hands or WW1 occurs over the 2nd Balkan War.]
June 1913
After the Bulgarian role in causing the Second Balkan War, three senior Ottoman ministers and their counterparts decided on taking Greek territory despite the distraction of a growing Bulgaria nearby. Although the debate regarding Edirne and eastern Thrace [which were under Bulgarian control] was underway, the Ottomans finally decided on assisting Bulgaria in attacks against the Greeks and Serbs. This was also assisted by anticipated Russian support for Serbia and the opportunity of recapturing Caucasian territories lost and weakening its Entente allies couldn't be missed. Also, Russia was responsible for the Balkan Wars by creating the independent Balkan states which attacked the Ottoman Empire months ago and Bulgaria might be a potential ally against Russia and other Balkan states.

After final debating, the Ottomans declared war on Greece on 25 June 1913, with Serbia and Montenegro responding on 27 June. Romania awaited the news with anticipation of a Serbian-Greek victory over Bulgaria before launching its offensive against Bulgaria following an Ottoman naval demonstration. The Ottoman Army was first sent to watch the Romanian border with Bulgaria and defeated an offensive by the Greeks at the Struma River intended to reach Kresna and the mountains of southern Thrace. [Redeployment of Bulgarian troops allowed the Greeks to advance slightly further compared to reality, but the Greek offensive was halted nevertheless by Ottoman 1st Army deployment.] The defeated offensive was followed by a counterattack that encircled the Greek Army on 1 August and it took less than a week to defeat the Greeks.
Source: https://en.wikipedia.org/wiki/Battle_of_Kresna_Gorge

In the aftermath, the Ottomans were ordered to push into Greece proper with Bulgarian assistance and Salonika with its surrounding peninsula was besieged on 15 August. The Greek Navy was ordered to support the besieged city, but an ambush led to a pyrrhic Ottoman victory over the Greeks [one battleship, one cruiser, auxiliaries and 2 destroyers lost in the battle for the Ottomans and 2 cruisers, 4 destroyers, a submarine, 3 ironclads and several merchant ships for Greece]. In the aftermath of the defeat, Greece had to abandon Salonika to its fate by starvation over 3 weeks of siege and the city was retaken by the Ottomans before passing into Bulgarian control following Bulgarian requests.

Finally, the Treaty of Salonika was signed on 15 September 1913, 10 days after the fall of Salonika and a week after the armistice. In the treaty, Greece lost Salonika and Western Thrace to the Ottomans, which were later passed to Bulgaria, $1 million for reparations to war damage and several smaller warships to Bulgaria and the Ottomans. Serbia and Romania signed peace treaties with Bulgaria and the Ottoman Empire on 20 September that resulted in another $1 million lost per country [except Montenegro] and disarming [with Greece] of several divisions. This was assisted by the defeat of Serbian and Romanian offensives against Bulgaria.
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