Original: The formation of Armenian revolutionary groups began roughly around the end of the Russo-Turkish War of 1878 and intensified with the first introduction of Article 166 of the Ottoman Penal code 166, and the raid of Erzerum Cathedral.
Simplified: The Armenian revolutionary groups started around the end of the Russo-Turkish War of 1878 and grew with the first introduction of Article 166 of the Ottoman Penal code 166, and the raid of Erzerum Cathedral.