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| 1911 | Balkan League Greece George I |  |
| The Balkan League is the Alliance of Serbia, Montenegro, Greece and Bulgaria against the Ottoman Empire during the Balkan Wars |
| 1912 | Balkan League Greece George I | |
| 8th Oct The first state to declare war is Montenegro, starting the First Balkan War |
| 29th May Sofia Signing of the Greco-Bulgarian treaty |
| 1912 | Battle of Elasson Greece Constantine I | |
| 23rd Oct Elasson Defeats the Turtks in the Vardar Valley |
| Kastoria One of Constantine's flank detachments is defeated by the Turks |
| Monista One of Constantine's flank detachments is defeated by the Turks |
| 5th Nov Venije Overwhelms the Turks & moves on to Salonika |
| 9th Nov Salonika The Turkish garrison of 20,000 surrenders & Constantine occupies the city |
| Greece lands forces in the Halkidiki peninsula while the main force of the army attacks from Thessaly into Macedonia through the Sarantaporo straight |
| Macedonia Leads a Greek Army into Macedonia to attack the Turks in the Varar Valley |
| 26th Oct After the liberation of Thessaloniki, the Greek army links up with the Serb army north and they turns west |
| Oct Members of the Balkan League attack Turkey & win quick victories |
| Aegean The Greek Navy is free to liberate the islands of the Aegean, starting with Lemnos which was used as a base to monitor the Dardanelles |
| Dec Aegean Following a ceasefire in December between the Ottoman Empire and Bulgaria, Serbia and Montenegro, the Turkish fleet twice exited the Dardanelles but was twice defeated in the battles of Elle and Lemnos |
| Lemnos The Greek Navy is free to liberate the islands of the Aegean, starting with Lemnos which was used as a base to monitor the Dardanelles |
| 1913 | Alliance Greece Constantine I | |
| 1st June An anti Bulgarian Serbian-Greek Alliance is signed |
| 24th June Greece & Serbia break their Alliance with Bulgaria over the Macedonia & Thrace border |
| 1913 | Assassination Greece George I | |
| Salonika Assassinated during the First Balkan War |
| 1913 | Capture of Adrianople Greece Constantine I | |
| 26th Mar Adrianople A combined Bulgar-Serb force captures Adrianople |
| Ioannina Bulgarian forces conquer Adrianople while Greek forces liberated Ioannina |
| 3rd Mar Yanina The Turkish garrison of 30,000 falls to Prince Constantine of Greece |
| 1913 | Death Greece George I | |
| Salonika Death of George I, assassinated during the First Balkan War |
| 1913 | Declaration of War Greece Constantine I | |
| 24th June The Macedonia & Thrace border dispute with Bulgaria causes the 2nd Balkan War |
| 13th Dec Aegean Greece is awarded some Aegean Islands for the loss of southern Albania to Albania |
| 13th Dec Southern Albania is divided between Albania & Greece |
| Ioannina Bulgarian forces conquer Adrianople while Greek forces liberated Ioannina |
| 13th Dec Greece gains territory in Macedonia |
| 13th Dec Thrace Greece gains territory in Thrace |
| 17th May London The war was ends with the treaty of London |
| 17th May London Under the treaty of London Albania is declared independent, Serbia, Montenegro and Greece are obliged to withdraw their forces |
