Editing Bulgarian Armed Forces (section)

===First World War===
{{main|Bulgaria during World War I}}
[[File:Nikola Todorov Zhekov.jpg|thumb|170px|Gen. [[Nikola Zhekov]], Commander-in-Chief of the Bulgarian Army during World War I]]
The [[Kingdom of Bulgaria]] participated in World War I on the side of the [[Central Powers]] between 15 October 1915, when the country declared war on [[Kingdom of Serbia|Serbia]], and 29 September 1918, when the [[Armistice with Bulgaria|Armistice of Thessalonica]] was signed. In the aftermath of the [[Balkan Wars]], Bulgarian opinion turned against Russia and the western powers, whom the Bulgarians felt had done nothing to help them. The government of [[Vasil Radoslavov]] aligned the country with [[German Empire|Germany]] and [[Austria-Hungary]], even though this meant also becoming an ally of the Ottomans, Bulgaria's traditional enemy. However, Bulgaria now had no claims against the Ottomans, whereas Serbia, Greece and Romania (allies of Britain and France) were all in possession of lands perceived in Bulgaria as its own.

In 1915 Germany promised to restore the boundaries according to the [[Treaty of San Stefano]] and Bulgaria, which had the largest army in the Balkans, declared war on Serbia in October of that year. In the First World War Bulgaria decisively asserted its military capabilities. The [[Battle of Doiran (1917)|second Battle of Doiran]], with Gen. [[Vladimir Vazov]] as commander, inflicted a heavy blow on the numerically superior [[British army]], which suffered 12,000 casualties against 2,000 from the opposite side. One year later, during the [[Battle of Doiran (1918)|third battle of Doiran]], the United Kingdom, supported by Greece, once again suffered a humiliating defeat, losing 3,155 men against just about 500 on the Bulgarian side. The reputation of the [[French army]] also suffered badly. The [[Battle of the Red Wall]] was marked by the total defeat of the French forces, with 5,700 out of 6,000 men killed. The 261 Frenchmen who survived were captured by Bulgarian soldiers.

Despite the outstanding victories, Germany was near defeat, which meant that Bulgaria would be left without its most powerful ally. The [[February Revolution|Russian Revolution]] of February 1917 had a great effect in Bulgaria, spreading antiwar and anti-monarchist sentiment among the troops and in the cities. In June Radoslavov's government resigned. In 1919 Bulgaria officially left the war with the [[Treaty of Neuilly-sur-Seine]].