Dima Halom Daogah (DHD) is an offshoot of the erstwhile Dimasa National Security Force (DNSF) which had surrendered en masse in 1995, except for its self-styled Commander-in-Chief Jewel Garlossa, who subsequently launched the outfit. It's purported objective was to create a separate Dimaraji (Dimasa land) for the Dimasa tribe comprising the North Cachar (NC) Hills district of Assam and some adjoining areas outside Assam.

The DHD cadres were reportedly trained and armed by the National Socialist Council of Nagaland--Isak-Muivah (NSCN-IM). In return, the NSCN-IM used to engage the DHD in extortion in the NC Hills and both the outfits used to issue extortion demand notes in joint letterheads. However, DHD leaders seemed to have distanced themselves from the NSCN-IM in the year 2000 and asserted that they would never want their territory to be included in Greater Nagaland (Nagalim) envisioned by NSCN-IM. Subsequent to the June 13, 2001 cease-fire extension agreement between the Union Government and the NSCN-IM, the differences between both the outfits seemed to have grown.

Significantly, DHD became the first terrorist outfit in Assam to issue an open threat to the immigrant Bangladeshis to vacate the NC Hills and the Karbi Anglong district. It started a massive campaign through hand bills, posters etc., against the settlers in the month of July 2001.

The combined operations of NSCN-IM and DHD cadres accounted for 22 deaths including that of 13 civilians and nine security force personnel in the year 2000. Reports indicate that the DHD terrorists had been extorting taxes from government employees, businessmen and traders in the district. In a recent act of insurgency, suspected terrorists of DHD were involved in the killing of nine policemen near Dehangi in North Cachar hills district on February 8, 2001.