Balkan Wars

1912–1913 Balkans Status: ended Casualties: ~200,000

The Balkan League pushed the Ottomans almost out of Europe in months. Then Bulgaria attacked her former allies and lost. The unresolved tensions — particularly Serbia's expansion — were the immediate fuse for World War I a year later.

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Belligerents

Balkan League (Serbia, Bulgaria, Greece, Montenegro)
Ottoman Empire
Bulgaria (in 2nd war)

Casualties

~200,000

From World at War, an interactive atlas by Jairus Pereira. Figures are approximate, drawn from Wikipedia, UCDP, ACLED and academic sources — a design artefact, not an authoritative register. Contact.