Yes, your statement is correct. Read the excerpt below about Mughal engagement with the Chakma after they were expelled from Arakan by a new King supported by the Bamars. Chakmas are rightfully our citizens and Bengali people have no right to settle there and bully them. A time will come when they will rebel against BD oppression.No It was mogul when they faught with Arakanese and captured Cht. The chakma King submitted to the mogul with peace treaty which started that they will maintaon their identity and no bangali settlement will be allowed. British just follow thought. Pakistan did not nullify but gave special status to Cht and frontier province.
Tribal people and their land in the CHT always had special privileges accorded to them since the time of Mughal Nawab Shayesta Khan that continued until Ziaur Rahman came to power. He domiciled Noakhailla people there (was it due to the insistence of Begum Khaleda, another Kyatta, who was from Begumganj?).
"The Arakan king Meng Rajagri (1593–1612) conquered these areas and addressed himself as the highest and most powerful king of Arakan, Chacomas and Bengal in a 1607 letter to a Portuguese merchant named Philip de Brito Nicote.[11] After the defeat by the Arakanese, the Chakmas migrated to the present Chittagong Hill Tracts and founded their capital city Alekyangdong (present-day Alikadam). From Alekyangdong, they continued north and settled in present-day Rangunia, Raozan, and Fatikchari Upazilas of Chittagong District".
"In 1666, Mughal Governor of Bengal Shaista Khan defeated the Arakanese, conquered the northern bank of Kaladan river, and renamed it Islamabad.[12]Mughal rule, however, was confined to the plain areas of Chittagong early on, leaving the Chakmas largely unaffected. The Mughals eventually demanded tribute from the Chakmas after a trade dispute developed between the two groups".[13]
"In 1713, the conflict was resolved and a stable relationship developed between the Chakmas and the Mughals; the latter never demanded complete subjugation from the former. The Mughals also rewarded the Chakma king Shukdev Roy; he established a new capital in his own name in an area still known as Shukbilash. Ruins of the royal palace and other historic buildings still exist. Subsequently, the capital was shifted to Rajanagar, Ranirhat, Rangunia Upazila, Chittagong District".