But Shujaa's son and successor was a weak voluptuary, who never left his own provinces; and although the Mirza, his deputy in the Vazirship and real locum tenens, received for his lifetime the reward of his merits, yet he was unable of himself to give a permanent consolidation to the tottering fabric. It has been seen that he was meditating a campaign against the Jats, whom Zabita's recent fall had again thrown into discontent, when summoned to Rohilkand, in 1774. In fact, he had already wrested from them the fort of Agra, and occupied it with a garrison of his own, under a Moghul officer, Mohammad Beg, of Hamadan. Not daunted by this reverse, Ranjit Singh, the then ruler of that bold tribe the Jats, advanced upon the capital, and occupied Sikandrabad with 10,000 horse. The forces left in Dehli consisted of but 5,000 horse and two battalions of sepoys; but they sufficed to expel the intruder. He shortly afterwards, however, returned, reinforced by the regulars and guns under Sumroo; but by this time the Mirza was returned from Rohilkand, and after the rains of 1774, marched against them, aided by a chief from Hariana, named after himself Najaf Kuli Khan, who brought into the field some 10,000 troops. This man, who was a good soldier and a faithful follower of the minister, was a converted Hindu, of the Rathur tribe; a native of the Bikanir country bordering on Rajputana Proper to the south, and to the north on Hariana and other states immediately surrounding the metropolis. Having been in service at Allahabad, under the father of Mohammad Kuli, the connection and early patron of the Mirza, he became a Mohammadan under the sponsorship of the latter, and ever after continued a member of his household. At the time of which I write, he had been appointed to the charge of districts returning twenty lakhs a year, with the title of Saif-ud-daulah.