Bakht Khan faced many problems which needed his immediate attention. The first and foremost problem was financial, to solve it he obtained from the Emperor authority to collect taxes. The second problem was the logistical one of supplies, which became more and more acute with the passage of time and even more so when British forces assaulted the city in September 1857. The British had many spies and agents in the city and were constantly pressurizing Bahadur Shah to surrender. The situation around Delhi proceeded to deteriorate rapidly; Bakht Khan's leadership could not compensate for the rebels' lack of organization, supplies and military strength. Delhi was besieged on 8 June 1857. On 14 September, the British assaulted the "Kashmiri Gate" and Bahadur Shah fled to Humayun's Tomb before surrendering to the British against Bakht Khan's pleas, on 20 September 1857. The emperor was arrested .His sons mirza Abu baker and mirza khirz khan were shot in cold blood. Innocent civilians of Delhi were killed along with many rebel leaders some being betrayed