The ostensible cause of his northward journey was the death of his brother, and a consequent revolt in Kâbul; but he did not return for fourteen long years--years that while they brought him success, while they justified his wisdom, brought him also much sorrow and disappointment. Though both earlier historians and Western commentators fail, as a rule, to notice it, there can be no doubt to those who, taking Akbar's whole character as their guide, attempt to read between the lines, that the emperor's policy changed greatly after he left Fatehpur Sikri behind him. A certain personal note is wanting in it. Take, for instance, the war which he carried out in the province of Swât, and which ended in a disaster that cost him his dearest friend, Râjah Birbal. Now that disaster was due entirely to this new note in Akbar's policy. He did not desire conquest; not, at least, conquest on the old blood-and-thunder lines. He wished, and he ordered, what we should nowadays call a "peaceful demonstration to the tribes." The army was to march through the Swât territory, using as little violence as possible, and return. The idea was outrageous to the regulation general, so Abul-fazl and Birbal drew lots as to which of them should go and keep Zein-Khân's martial ardours in check. It fell on Birbal; much, it is believed, to Akbar's regret. Of the exact cause of disagreement between Birbal and Zein-Khân little is known; but they did disagree, and with disastrous results. The whole Moghul army was practically overwhelmed, and it is supposed that Birbal, in attempting escape by the hills, was slain. His body was never found. Elphinstone, in his History, accuses Abul-fazl of giving a confused and contradictory account of this event, "though he must have been minutely informed of its history"; but a little imagination supplies a cause for this: Abul-fazl knew that Birbal was undoubtedly acting on the king's orders. The emperor for a long time refused even to see Zein-Khân, and he was inconsolable for the loss of his friend--his greatest friend--who had known his every thought. It is said, indeed, that these two men, both keenly interested in the answer to the Great Riddle of Life, the one Agnostic, the other hopeless Optimist by virtue of his genius, had agreed that they would come back the one to the other after death if possible, and that therein lay Akbar's strange eagerness to credit the many reports which gained currency, that Birbal had been seen again alive. There can be no doubt but that the loss of his friend saddened the remainder of Akbar's life. Indeed, it may be said that from the year in which he quitted Fatehpur Sikri, thus abandoning his Town of Conquest to the flitting bats, the prowling hyenas, the year also of Birbal's loss, a cloud seems to fall over the gorgeous pageant of Akbar's royalty.