The Sikh Khalsa's rise to power began in the 17th century during a time of growing militancy against Mughal rule. The creation of a Sikh Empire began when Guru Gobind Singh sent a Sikh general, Banda Singh Bahadur, to fight the Mughal rulers of India and those who had committed atrocities against Pir Buddhu Shah. Banda Singh advanced his army towards the main Muslim Mughal city of Sirhind and, following the instructions of the Guru, punished all the culprits. Soon after the invasion of Sirhind, while resting in his chamber after the Rehras prayer Guru Gobind Singh was stabbed by a Pathan assassin hired by Mughals. Gobind Singh killed the attacker with his sword. Though a European surgeon stitched the Guru's wound, the wound re-opened as the Guru tugged at a hard strong bow after a few days, causing profuse bleeding that led to Gobind Singh's death.