Ilinden–Preobrazhenie Uprising

The Ilinden–Preobrazhenie Uprising was an uprising by mostly Bulgarian and some of the Aromanian population in certain regions in the Ottoman Empire. The uprising was against Ottoman rule.
The uprising lasted from 2 August 1903 up to November 1903. 
The name of the uprising comes from the Christian Orthodox holy day of Ilinden as well as another holy day known as Preobrazhenie on which the revolts began. 
Ultimately the uprising was crushed by the better equipped and much larger Ottoman army. The casualties were on both sides were small however a large number of people were made homeless, the majority of which number around 30,000 fled to Bulgaria.