Abstaining from the Initial Balkan War against the Ottoman Empire, the Kingdom of Romania entered the Second Balkan War in June 1913 against the Tsardom of Bulgaria. 330,000 Romanian troops moved across the Danube and into Bulgaria. One army occupied Southern Dobrudja and another moved into northern Bulgaria to threaten Sofia, helping to bring an end to the war. Romania thus acquired the ethnically-mixed territory of Southern Dobrudja, which it had desired for years.