Dost Muhammad Khan sent a 25,000 strong force, including a large number of local irregulars and equipped with 18 heavy guns, to invest Jam rud. The Sikh garrison there had only 600 men and a few light artillery pieces. The Afghans besieged the fort and cut off its water supply, while a detachment was sent to the neighbouring Sikh fort of Shabqadar to prevent any help from that direction. Mahan Singh Mirpuri, the garrison commander of Jamrud, kept the invaders at bay for four days and managed meanwhile to send a desperate appeal for help to Hari Singh Nalva at Peshawar. Nalva rose from his sick bed and rushed to Jamrud.