 Complete the following phrase:  During the Bulgarian Uprising 1876 against Ottoman rule, and the Russo-Turkish War 18771878, the persecution of the Bulgarian Christian population was conducted by Ottoman soldiers. The principal locations were Panagurishte, Perushtitza, and Bratzigovo. Over 15,000 non-combatant Bulgarian civilians were killed by the Ottoman army between 1876 and 1878, with the worst single instance being the 