 Sadashivrao Bhau was there upon made commander in chief of the Maratha Army, under whom the Battle of Panipat was fought.After Maratha defeat at Third Battle of Panipat, his brother Nanasaheb Peshwa's death and his half brother's (Shamsher Bahadur) death in 1761, the Peshwa title was passed on to Madhavrao I, second son of Nanasaheb.Madhavrao was a minor when appointed Peshwa.