He organised resistance movements against the Ottomans throughout the 19th-20th centuries; in one such uprising, he gathered 5,000-6,000 Albanian fighters outside of Gjakova and attacked the garrison in an attempt to enter the city.
[3] In 1904, 10 Ottoman battalions accompanied by artillery were sent to Gjakova in order to quell the uprising, and were subsequently tasked with enforcing harsh taxes on the local Albanian population as retribution; the hostilities were accompanied by the forcible collection of taxes from the local population and the destruction of entire villages in the Gjakova region by Ottoman forces.
The Gjakova region saw a series of ensuing battles resulting in the deaths of more than 900 Ottoman soldiers as well as 2 bimbashis and a dozen officers, whereas the Albanians only suffered 170 dead or wounded.
By 1912, Sulejman Aga had once again formed a large band of Albanian resistance fighters that supported the plundering of the Ottoman military depots in Gjakova and Prizren.
[15] When Gjilan was liberated on 28 July 1912 after Ottoman forces were crushed outside the city, the Albanian rebels were welcomed with open arms by the local inhabitants.