On October 1950, the government informed that they would accept the insurgents who wanted to surrender. Hadjar visited Kandangan and told them that he had surrendered. The government asked Hadjar to persuade his colleagues to surrender. However, he did not do it and instead led an insurrection against the government. In early 1951, the chairman of Hulu Sungai Regional People's Representative, , persuaded Ibnu Hadjar to surrender. During the early four years (1950-1954), Ibnu Hadjar and his forces attacked Kandangan four times, and the government managed to repulse them. Likewise, he also planned two attacks in Banjarmasin, which were on August 1953 and 1954 new year and the government thwarted the plans. At the end of 1954, Ibnu Hadjar announced that KjRT joined Darul Islam after Kartosoewirjo offered him a ministerial position in Islamic State of Indonesia. Kartosoewirjo appointed Ibnu Hadjar as the Darul Islam Territorial Commandant of Kalimantan. After KjRT joined Darul Islam, Ibnu Hadjar made several changes. He proclaimed himself as Ulul-Amri and named his forces into Angkatan Perang Tentara Islam (Islamic Army War Forces/APTI). Likewise, he renamed his headquarter to Istana Islam Merdeka (Free Islamic Palace).
