The Herzegovina Uprising of 1875 prompted Montenegro and Serbia to declare war on the Ottoman Empire , sparking the Great Eastern Crisis of 1875 -- 78 .
This was followed by about a decade of peace , but in 1872 , the Ottomans massacred more than 20 Montenegrins .
The Herzegovina Uprising of 1875 prompted Montenegro and Serbia to declare war on the Ottomans   , sparking the Great Eastern Crisis of 1875 -- 78 .
This was followed by about a decade of peace , but in 1872 , the Ottomans massacred more than 20 Montenegrins .