After suffering a disastrous defeat at the Battle of Dobro Pole, soldiers in the Bulgarian Army began to defect on this day in 1918, marching towards the capital with the intent of abolishing the monarchy and establishing a Republic.

Over the course of five days, the uprising involved every unit stationed in the Vardar plain up to the Bitolia region. Although some of the rebels returned to their villages, a force more than ten thousand strong began to march towards the capital, intent on abolishing the monarchy and establishing a republic.

In Radomir, the rebels proclaimed the new "Republic in Radomir" on September 27th, 1918, and stormed the capital Sofia the next day.

The revolutionaries were overwhelmed by government forces, however, and they were militarily defeated within a matter of days (although it took more than a month to "pacify" the country).

Despite this military defeat, King Ferdinand was forced to abdicate the throne and Bulgaria formally withdrew from World War I the next year in the Treaty of Neuilly.