organised a survey of agricultural land and a tax assessment on what it produced. To increase revenue, Murshid Quli Khan granted loans for seed, livestock, and irrigation infrastructure. The Deccan returned to prosperity, Aurangzeb proposed to resolve the situation by attacking the dynastic occupants of Golconda (the Qutb Shahis) and Bijapur (the Adil Shahis). As an adjunct to resolving the financial difficulties, the proposal would also extend Mughal influence by accruing more lands. Aurangzeb advanced against the Sultan of Bijapur and besieged Bidar. The Kiladar (governor or captain) of the fortified city, Sidi Marjan, was mortally wounded when a gunpowder magazine exploded. After twenty-seven days of hard fighting, Bidar was captured by the Mughals and Aurangzeb continued his advance. Again, he was to feel that Dara had exerted influence on his father: believing that he was on the verge of victory in both instances, Aurangzeb was frustrated that Shah Jahan chose then to settle for negotiations with the opposing forces rather than pushing for complete victory. War of succession The four sons of Shah Jahan all held governorships during their father's reign. The emperor favoured the eldest, Dara Shukoh. This had caused resentment among the younger three, who sought at various times to strengthen alliances between themselves and against Dara. There was no Mughal tradition of primogeniture, the systematic passing of rule, upon an emperor's death, to his eldest son. Instead it was customary for sons to overthrow their father and for brothers to war to the death among themselves. Historian Satish Chandra says that "In the ultimate resort, connections among the powerful military leaders, and military strength and capacity [were] the real arbiters". The contest for power was primarily between Dara Shikoh and Aurangzeb because, although all four sons had demonstrated competence in their official roles, it was around these two that the supporting cast of officials and other influential people mostly circulated. There were ideological differences — Dara was an intellectual and a religious liberal in the mould of Akbar, while Aurangzeb was much more conservative — but, as historians Barbara D. Metcalf and Thomas R. Metcalf say, "To focus on divergent philosophies neglects the fact that Dara was a poor general and leader. It also ignores the fact that factional lines in the succession dispute were not, by and large, shaped by ideology." Marc Gaborieau, professor of Indian studies at l'École des Hautes Études en Sciences Sociales,