Rao Bal Kishan

Rao Bal Kishan was an Yaduvanshi Ahir king of Haryana-Delhi. Under his rule, the Ahirwal covered present day districts of Rewari, Mahendergarh, Narnual, Charkhi Dadri, Hissar, Jhajjar, Rohtak, Gurgaon, Najafgarh, Dwarka, Bahadurgarh, Rohini, Alwar and Jaipur.
Early Life.
Rao Bal Kishan was born to Rao Nand Ram Singh of the royal Yaduvanshi Ahir family of Rewari . It is said that he killed a lion without wearing armor. This earned him the title of "Sher Bacha Shamsher Bahadur". He was married to the daughter of a Ahir Sardar Ramchandra of Takana Nasibpur.
Battle of Karnal.
In 1739, the Iranian ruler Nadir Shah attacked India. Rao Bal Kishan, with his army and with the forces of Delhi, fought Nadir Shah. His army included 5000 infantry and 2000 cavalry. In February 1739, Nader Shah captured Sirhind and moved towards the field of Karnal, a battle destined to be fateful to the Mughal rulers. On 13 February, the battle of Karnal was fought. Emperor Muhammad Shah had over a hundred thousand force against Nader Shah's 55,000 men but was still decisively defeated because royal force left the Battlefield at Karnal. Only Rao Balkishan Singh fought to Nadir shah, he was killed in the battle but immortalized the name "Vijay or Veergati". The Battle was ambitious as Nadir Shah itself remarked to Mughal Emperor that if your combined forces helped Rao Balkrishna of Rewari, than I might not able to enter in Delhi. I had never seen any warrior like him brave , Fierce and strong. After this to a royal chhatri kiosk was made by Mughal Emperor to remark tribute to Rao Balkrishna. Even today the Chhatri is present in Karnal. 
Post Battle.
After the battle, Nadir Shah met the Mughal emperor and praised Rao Bal Kishan and his soldiers. He said - "If Rao Bal Kishan had not been martyred in the battle and Faujshahi (Mughal armies) supported that brave Sardar whole heartedly instead of escaping from the battlefield, we would not had the luck to see Delhi today, but it would also have been difficult to return to Iran alive.
Death.
Rao Balkishan was killed in an ambush by the Iranian troops in the Battle of Karnal on 24 February, 1739.