They invaded Chittagong and won a vast territory starting from modern day Feni to Cox's Bazar.

It is said that Dohazari was named because there was an army camp of two thousand soldiers (fort & including areas), this was Lakhsman Singh Hazari's command post.

On the other hand, another possibility for the naming was, the actual rank title of Lakhsman Singh was Do Hazari; which meant commander of two thousand soldier or sowar (cavalry).

In social service activities, Hazari family donated and helped for establishing two schools, one college, mosque, temples at Dohazari.

The family made a great influence for the development of the area, as a result, Dohazari is now the most influential business centre and a municipality of South Chittagong.