During his tenure Battle of Jammu (1712) was fought in which he sided with Mughals to defeat Banda Singh Bahadur.
[2] According to the Rajdarshani, a historical chronicle by 19th-century historian Ganeshdas Badenra, the Mubarak Mandi palace was founded when Raja Dhruv Dev in 1710, after consulting his astrologers, moved his residence from the older palace in Purani Mandi to a new, grander location overlooking the Tawi River .
[4][5][6]During his time Jammu became a tributary of Jhanda Singh of Bhangi Misl.
Raja Braj Dev was a ruler of the Deva dynasty of Jammu, Jamwal Dogras, who ruled from 1782 to 1787.
In this battle Sikh chief Jhanda Singh Dhillon was shot dead.