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In page Sofia:
"In the Second Balkan War, Bulgaria was fighting alone practically all of its neighbouring countries. When the Romanian Army entered Vrazhdebna in 1913, then a village 11 kilometres (7 miles) from Sofia, now a suburb,[7] this prompted the Tsardom of Bulgaria to capitulate.[citation needed] During the war, Sofia was overflown by the Romanian Air Corps, which engaged on photoreconnaissance operations and threw propaganda pamphlets to the city. Thus, Sofia became the first capital on the world to be overflown by enemy aircraft.[8]
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