The period between 1878 and 1914 was one of stability and progress for Romania. During the Second Balkan War, Romania joined Greece, Serbia and Montenegro against Bulgaria. Bulgaria, dissatisfied with its share of the spoils of the First Balkan War, attacked its former allies, Serbia and Greece, on June 29 - Aug 10 1913. Serbian and Greek armies repulsed the Bulgarian offensive and counterattacked, entering Bulgaria. With Bulgaria's also having previously engaged in territorial disputes with Romania^[77] and the bulk of Bulgarian forces engaged in the south, the prospect of an easy victory incited Romanian intervention against Bulgaria. The Ottoman Empire also took advantage of the situation to regain some lost territories from the previous war. When Romanian troops approached the capital Sofia, Bulgaria asked for an armistice, resulting in the Treaty of Bucharest, in which Bulgaria had to cede portions of its First Balkan War gains to Serbia, Greece and Romania. In the Treaty of Bucharest of 1913, Romania gained Southern Dobruja and established the Durostor and Caliacra counties.^[78]