![](https://www.historynet.com/wp-content/uploads/2022/03/Bomb-dropping-Bulgaria-1913-scaled.jpg)
Bulgarian airmen prepare for a mission to drop a bomb from their Bleriot XI aircraft during the First Balkan War, circa 1913. The Bulgarian Air Force was the first to use airplanes for offensive military action. (FPG/Hulton Archive/Getty Images)
Bulgarian airmen prepare for a mission to drop a bomb from their Bleriot XI aircraft during the First Balkan War, circa 1913. The Bulgarian Air Force was the first to use airplanes for offensive military action. (FPG/Hulton Archive/Getty Images)