aug 12, 1914 - The Balkan Front is opened as Austro-Hungary invades Serbia

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The Battle of Cer begins, with Austro-Hungary invading Serbia around the Mountain of Cer. Serbian casualties after nearly ten days of fighting were 3,000–5,000 killed and 15,000 wounded. Those of the Austro-Hungarians were significantly higher, with 6,000–10,000 soldiers killed, 30,000 wounded and 4,500 taken as prisoners of war. The Serbian victory over the Austro-Hungarians marked the first Allied victory over the Central Powers in the opening days of the First World War, and the first aerial dogfight of the war took place during the battle

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