Second Balkan War
June 29 – August 10, 1913
Bulgaria attacked its former allies Serbia and Greece over the division of Macedonia; Romania and the Ottoman Empire joined in, and Bulgaria lost most of its gains.
Battles 3
June 30 – July 9, 1913
Battle of Bregalnica
Battle of Bregalnica
July 2–4, 1913
Battle of Kilkis–Lachanas
Battle of Kilkis–Lachanas
July 21–31, 1913
Battle of Kresna Gorge
Battle of Kresna Gorge