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| 1913 | Alliance Ferdinand I |  |
| 1st June An anti Bulgarian Serbian-Greek Alliance is signed |
| 1911 | Balkan League Ferdinand I | |
| Following Italy's victory in the Italo-Turkish War of 1911-1912 the Young Turks fell from power after a coup, the Balkan countries see this as an opportunity to attack and fulfill their desires of expansion |
| The Balkan League is the Alliance of Serbia, Montenegro, Greece and Bulgaria against the Ottoman Empire during the Balkan Wars |
| 1912 | Balkan League Ferdinand I | |
| 13th Mar A secret bilateral defensive Alliance is agreed between Serbia and Bulgaria |
| 13th Mar Serbia and Bulgaria sign treaties to split between them the land of Vardar Macedonia |
| 29th May Signing of the Greco-Bulgarian treaty |
| Oct The First Balkan War breaks out following an impossible ultimatum given to the Porte |
| 8th Oct The first state to declare war is Montenegro, starting the First Balkan War |
| 1912 | Battle of Elle Ferdinand I | |
| Dec Elle 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 |
| 1912 | Battle of Lemnos Ferdinand I | |
| Dec Lemnos 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 |
| 1913 | Capture of Adrianople Ferdinand I | |
| Adrianople Bulgarian forces conquer Adrianople while Greek forces liberate Ioannina. |
| 1913 | Declaration of War Ferdinand I | |
| 24th June Greece & Serbia break with Bulgaria over the Macedonia & Thrace border |
| 1912 | Invasion of Thrace Dimitriev, Radko | |
| Takes three Bulgarian Armies into Thrace in the direction of Adrianople |
| 1912 | Invasion of Turkey Ferdinand I | |
| Bulgaria attacks Eastern Thrace, stopped at the outskirts of Constantinople in the Chataldja line |
| 1913 | Mobilization Danev, Stojan | |
| 29th June Greece & Serbia are attacked without Danev's knowledge |
| 1913 | Mobilization Savov, Michael | |
| 29th June Attacks the Greek & Serbian positions & gives them an opportunity to attack Bulgaria |
| 1913 | Mobilization Danev, Stojan | |
| 10th Aug Bulgaria is attacked by Turkey & Romania |
| 1912 | Partition Ferdinand I | |
| An Alliance is agreed between Bulgaria & Serbia to partition Macedonia |
| 1913 | Rule of Thrace Ferdinand I | |
| 30th May Thrace Under the treaty of London Bulgaria receives Thrace north of the line between Enos on the Aegean Sea and Midia on the Black Sea |
| 1913 | Siege of Adrianople Ferdinand I | |
| Adrianople Bulgarian forces conquer Adrianople while Greek forces liberate Ioannina. |
| 1913 | Succession Ferdinand I | |
| Succeeds as King of Bulgaria, defeated in the 2nd Balkan war |
| 1913 | Treaty of London Ferdinand I | |
| 30th May London The war was ends with the treaty of London |
| 30th May London Under the treaty of London Bulgaria receives Thrace north of the line between Enos on the Aegean Sea and Midia on the Black Sea |
