They were to push for the Ilinden-Preobrazhenie Uprising and later became the core of IMRO right-wing faction. The former organisation became known earlier than IMRO, after the 1895 raids into Turkish territory it organised from Bulgaria. Its founders were Macedonian immigrants in Bulgaria as well as Bulgarian army officers. They became known as the "supremists" or "externals" since they were based outside of Macedonia. The supremists resorted to terrorism against the Ottomans in the hope of provoking a war and thus Bulgarian annexation of Macedonia. For a time in the late 1890s IMARO leaders managed to gain control of the Supreme Committee but it soon split into two factions: one loyal to the IMARO and one led by some officers close to the Bulgarian prince. The second one staged an ill-fated uprising in Eastern Macedonia in 1902, where they were opposed militarily by local IMARO bands led by Yane Sandanski and Hristo Chernopeev, who were later to become the leaders of the IMARO left wing.