Lord Minto's main work was to keep Napoleon and the French out of India. The north-west frontier was still vulnerable, but the Afghans had retired from the Punjab, and the once famous Runjeet Singh had founded a Sikh kingdom between the Indus and the Sutlej. As far as the British were concerned, the Sikhs formed a barrier against the Afghans; and Runjeet Singh was apparently friendly, for he had refused to shelter Jaswant Rao Holkar in his flight from Lord Lake. But there was no knowing what Runjeet Singh might do if the French found their way to Lahore. To crown the perplexity, the Sikh princes on the British side of the river Sutlej, who had done homage to the British government during the campaigns of Lord Lake, were being conquered by Runjeet Singh, and were appealing to the British government for protection. [Sidenote: Mission to Runjeet Singh, 1808-9.] In 1808-9 a young Bengal civilian, named Charles Metcalfe, was sent on a mission to Lahore. The work before him was difficult and complicated, and somewhat trying to the nerves. The object was to secure Runjeet Singh as a useful ally against the French and Afghans, whilst protecting Sikh states on the British side of the Sutlej, namely, Jhind, Nabha, and Patiala. Runjeet Singh was naturally disgusted at being checked by British interference. It was unfair, he said, for the British to wait until he had conquered the three states, and then to demand possession. Metcalfe cleverly dropped the question of justice, and appealed to Runjeet Singh's self-interest. By giving up the three states, Runjeet Singh would secure an alliance with the British, a strong frontier on the Sutlej, and freedom to push his conquests on the north and west. Runjeet Singh took the hint. He withdrew his pretensions from the British side of the Sutlej, and professed a friendship which remained unbroken until his death in 1839; but he knew what he was about. He conquered Cashmere on the north, and he wrested Peshawar from the Afghans; but he refused to open his dominions to British trade, and he was jealous to the last of any attempt to enter his territories. [Sidenote: Missions to Persia and Afghanistan.] About the same time Lord Minto sent John Malcolm on a second mission to Persia, and Mountstuart Elphinstone on a mission to Cabul to provide against French invasion. Neither mission was followed by any practical result, but they opened up new countries to European ideas, and led to the publication of works on Persia and Afghanistan by the respective envoys, which have retained their interest to this day. [Sidenote: Capture of Mauritius and Java.]