The April Uprising (Bulgarian: Априлско въстание, romanized: Aprilsko vastanie) was an insurrection organised by the Bulgarians in the Ottoman Empire from April to May 1876. The rebellion was suppressed by irregular Ottoman bashi-bazouk units that engaged in indiscriminate slaughter of both rebels and non-combatants (see Batak massacre).
The American community around Robert College in Istanbul, the Protestant mission in Plovdiv headed by J.F. Clarke as well as two other Americans, journalist Januarius MacGahan and diplomat Eugene Schuyler, were indispensable in bringing knowledge of Ottoman atrocities to the wider European public.