The April Uprising (Bulgarian: Aprilsko vastanie) was an insurrection organised by the Bulgarians in the Ottoman Empire from April 1876, which resulted in the re-establishment of Bulgaria in 1878. Тhe regular Ottoman Army and irregular bashi-bazouk units brutally suppressed the rebels, leading to a public outcry in Europe and the United States, with many famous intellectuals condemning the Ottoman atrocities and supporting the oppressed Bulgarian population.
The 1876 uprising involved only those parts of the Ottoman territories populated predominantly by Bulgarians. The emergence of Bulgarian national sentiments was closely related to the re-establishment of the independent Bulgarian Orthodox Church in 1870. Together with notions of romantic nationalism, the rise of national awareness became known as the Bulgarian National Revival.
The April uprising was a failure as a revolution, but it showed to the world that Bulgarians are ready to die for their freedom. Due to publicity that was given to the reprisals that followed, it led directly to European demands for reform of the Ottoman Empire, and the Russo-Turkish War, which ended in Turkish defeat.
Liberation of Bulgaria refers to the end of the Russo-Turkish War of 1877-78 that led to the re-establishment of the Bulgarian state under the Treaty of San Stefano of March 3, 1878.
According to the treaty, the Ottoman Empire was deprived of a large portion of its territory, which was returned to Bulgaria.