The Battle of Odrin or Siege of Odrin (Bulgarian: Обсада на Одрин, Serbian: Опсада Једрена, Turkish: Edirne Kuşatması) was fought during the First Balkan War, beginning in mid-November 1912 and ending on 26 March 1913 with the capture of Edirne (Adrianople) by the Bulgarian 2nd Army and the Serbian 2nd Army.