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| 1913 | Balkan League Ferdinand I |  |
| 17th June Bulgaria is the first to attacked, without formally declaring war, attacking the Serbian army in Gevgelija and then the Greek army in Nigrita |
| 1913 | Battle of Kilkis Lahanas Ferdinand I | |
| June Kilkis Lahanas The Greek army counterattacks and defeats the Bulgarians at Kilkis-Lahanas |
| 1913 | Battle of Kresna Ferdinand I | |
| July Kresna Part of the Greek army advances up the Struma River valley, defeating the Bulgarian army in the battles of Doiran and Mt Beles before themselves being defeated at the Kresna straights |
| 1913 | Battle of Mount Beles Ferdinand I | |
| July Mount Beles Part of the Greek army advances up the Struma River valley, defeating the Bulgarian army in the battles of Doiran and Mt Beles before themselves being defeated at the Kresna straights |
| 1913 | Capture of Adrianople Ferdinand I | |
| Adrianople The Ottomans retake Adrianople (Edirne) which had historic significance for the Turks, being a former Ottoman capital city |
| 1913 | Capture of Thrace Ferdinand I | |
| Thrace The Ottomans recover eastern Thrace, which had largely been lost in the First Balkan War |
| 1913 | Declaration of War Ferdinand I | |
| 27th June Romania raises an army and declares war on Bulgaria |
| 1913 | Invasion of Bulgaria Ferdinand I | |
| July The Romanians encounter little resistance from the Bulgarians, and by the time of the ceasefire are only 30 kilometers from Sofia |
| 1913 | Peace Ferdinand I | |
| July The Greeks offer a ceasefire and the Bulgarians accept due to the danger posed by the Romanian army in the north |
| 1913 | Rule of Thrace Ferdinand I | |
| Thrace The Ottomans recover eastern Thrace, which had largely been lost in the First Balkan War |
| 1913 | Siege of Gevgelija Ferdinand I | |
| 17th June Gevgelija Bulgaria is the first to attacked, without formally declaring war, attacking the Serbian army in Gevgelija and then the Greek army in Nigrita |
| 1913 | Siege of Nigrita Ferdinand I | |
| 17th June Nigrita Bulgaria is the first to attacked, without formally declaring war, attacking the Serbian army in Gevgelija and then the Greek army in Nigrita |
| 1913 | Siege of Serres Ferdinand I | |
| June Serres The Greek army does not enter the city of Serres in time to prevent it being razed by irregular Bulgarian units |
| 1913 | Treaty of Bucharest Ferdinand I | |
| 12th Aug Bucharest A final peace is agreed in the treaty of Bucharest |
| 1913 | Treaty of London Ferdinand I | |
| June As a result of the terms of the treaty of London, the Second Balkan War breaks out |
