Explanation:

 Kirata were the inhabitants of plains and hills of various regions of Himalaya (here Himachal and Uttarakhand). Aryans used to loot regularly from Kirat inhabitants. Looting by Aryans was life and death problems for Kiratas.

The Kirata’s powerful king was ‘Shambar” , who fought against the Aryan King ‘Divodas’. Rishi Bharadawaj was the advisor of the Aryan King’ Divodas’ . The war between the two lasted for 40 years and has been discussed in the Rig Veda by Rishi Vashishta and Vamdeva. Shambar and his ally, Verchi were killed at a place named ‘Udubraj’. Divodas was succeeded by his son ‘Sudas’ and Bharadwaj by Rishi Vashishta.