i got this from website : http://www.bookrags.com/wiki/Balaji_Vishwanath
During the Maratha civil war (1707-1713), Maratha Senapati (Marathi for general) Chandrasen Jadhav, who led the Tarabai faction (his predecessor Rajaram's widow who opposed Shahuji), ravaged the Southern provinces but was defeated by Balaji after a prolonged war.
In 1713, Shahuji was attacked at Khed by forces loyal to Tarabai. To face this attack, Shahuji appointed Balaji as Senakarta (Marathi for Army Commander).
This increased the confidence Shahu had in him, and he appointed Balaji as his representative to negotiate with Kanhoji Angre, the Admiral of the Maratha Navy, who was allied with Tarabai. Before Balaji could take up this assignment, he requested Shahuji to appoint him as a Peshwa. Shahu conceded this request, and Balaji became the Chattrapati's first Peshwa on November 16, 1713. Kanhoji agreed to become the Sarkhel (Marathi for Admiral) of Shahuji's navy.
Kanhoji Angre or Conajee Angria or Sarkhel Angre (? – 1729) was the first notable chief of the Maratha Navy in 18th century India. He harassed British, Dutch and Portuguese naval interests in the Indian Ocean during the 18th century, and hence was known to them as a pirate. Similar work was carried out against the colonial powers by the Kunjali Marakkars in the 16th century. Despite the attempts of the British and Portuguese to subdue Angre, he remained undefeated until his death.