The kingdom included present day districts of undivided Midnapore and parts of Hoogly and Howrah of West Bengal.
[2][3] Pandu (the father of Pandavas) after defeating the Magadhas and the Videhas of Mithila, led his army against Kashi, Suhma, and Pundra, as well as by the strength and prowess of his arms spread the fame of the Kurus.
Arjuna, that bull amongst the son of Pandu, at the head of all his troops, fiercely attacked the regions called Suhma and Sumala during his military campaign to collect tribute to Yudhishthira's Rajasuya.
The Pandava Bhima subjugated in battle those strong and brave heroes of fierce prowess.
The fourth canto of the epic poem Raghuvamsa, written by Kalidasa mentions that King Raghu of Ikshavaku Dynasty during his conquest in the East, he had defeated the Suhmas.In order to save their lives, they begged for his mercy.