The settlement of the Second Balkan War had also inflamed Bosnian nationalism. In 1914 that movement ignited an AustrianSerbian conflict that escalated into world war when the European alliances of those countries went into effect.

Prewar Bulgarian Politics

Supported by Ferdinand, the government of Prime Minister Vasil Radoslavov declared neutrality to assess the possible outcome of the alliances and Bulgaria's position relative to the Entente (Russia, France, and Britain) and the Central Powers (AustriaHungary and Germany). From the beginning, both sides exerted strong pressure and made territorial offers to lure Bulgaria into an alliance. Ferdinand and his diplomats hedged, waiting for a decisive military shift in one direction or the other. The Radoslavov government favored the German side, the major opposition parties favored the Entente, and the agrarians and socialists opposed all involvement. By mid-1915 the Central Powers gained control on the Russian and Turkish fronts and were thus able to improve their territorial offer to Bulgaria. Now victory would yield part of Turkish Thrace, substantial territory in Macedonia, and monetary compensation for war expenses. In October 1915, Bulgaria made a secret treaty with the Central Powers and invaded Serbia and Macedonia.

Early Successes

Catching the Entente by surprise, Bulgarian forces pushed the Serbs out of Macedonia and into Albania and occupied part of Greek Macedonia by mid-1916. British, French, and Serbian troops landed at Salonika and stopped the Bulgarian advance, but the Entente's holding operation in Greece turned into a war of attrition lasting from late 1916 well into 1917. This stalemate diverted 500,000 Entente troops from other fronts. Meanwhile, Romania had entered the war on the Entente side in 1916. Bulgarian and German forces pushed the poorly prepared Romanians northward and took Bucharest in December 1916. The Bulgarians then faced Russia on a new front in Moldavia (the part of Romania bordering Russia), but little action took place there.

Stalemate and Demoralization

Once the Bulgarian advance into Romania and Greece halted, conditions at the front deteriorated rapidly and political support for the war eroded. By 1916 poor allocation of supplies created shortages for both civilians and soldiers, and a series of government reorganizations provided no relief. By 1917 the military stalemate and poor living conditions combined with news of revolution in Russia to stir large-scale unrest in Bulgarian society. The agrarians and socialist workers intensified their antiwar campaigns, and soldiers' committees formed in army units. Bolshevik antiwar propaganda was widely distributed in Bulgaria, and Russian and Bulgarian soldiers began fraternizing along the Moldavian front. In December 1917, Dimitur Blagoev, founder and head of the Social Democratic Party, led a meeting of 10,000 in Sofia, demanding an end to the war and overthrow of the Bulgarian government. A wave of unrest and riots, including a "women's revolt" against food and clothing shortages, swept through the country in 1918.

The government position weakened further when the Treaty of Bucharest, which divided the territory of defeated Romania among the central powers, left part of the disputed Romanian territory of Dobruja outside Bulgarian control. Having failed to secure even the least important territory promised by its war policy, the Radoslavov government resigned in June 1918. The new prime minister, Aleksandur Malinov, tried to unite the country by appointing the agrarian Aleksandur Stamboliiski to his cabinet. But Malinov had vowed to fight, and the BANU leader refused the post as long as Bulgaria remained in the war. By September the Bulgarian army was thoroughly demoralized by antiwar propaganda and harsh conditions. A battle with the British and French at Dobro Pole brought total retreat, and in ten days Entente forces entered Bulgaria. On September 29, the Bulgarians signed an armistice and left the war.

Capitulation and Settlement

The retreat from Dobro Pole brought a soldier revolt that was crushed by German troops near Sofia. But the parties in power forced Ferdinand to abdicate at the end of September because they feared full-scale revolution and blamed the tsar for the country's chaotic state. Ferdinand's son Boris was named tsar, becoming Boris III. The immediate cause of social upheaval ended with the armistice, but shortages and discontent with the Bulgarian government continued. An ineffective coalition government ruled for the next year, then a general election was called. Meanwhile, Bulgaria was again left far short of the territorial goals for which it had declared war. In the Treaty of Neuilly-sur-Seine (November 1919), Thrace was awarded to Greece, depriving Bulgaria of access to the Aegean Sea. The newly formed Kingdom of the Serbs, Croats, and Slovenes took Macedonian territory adjoining its eastern border, and Southern Dobruja went to Romania.

The treaty limited the postwar Bulgarian Army to a small volunteer force; Yugoslavia, Romania, and Greece were to receive reparations in industrial and agricultural goods; and the victorious Allies were to receive monetary reparations for the next thirty-seven years. On the other hand, the payment schedule was significantly improved in 1923, and Bulgaria's loss of 14,100 square kilometers was much less than the territorial losses of its wartime allies. Nationalist resentment and frustration grew even stronger because of this outcome, however, and Bulgaria remained close to Germany throughout the interwar period.

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Source: U.S. Library of Congress