Gurudwara Lohgarh Sahib, about One km to the northwest of Harimandar, marks the site of a fort of the same name (lit. fort of steel) constructed by Guru Hargobind for the defence of the town. The main battle of Amritsar between the Guru and an imperial force under Mukhlis Khan in May 1629 was fought here. The present Gurdwara stands on the ruined mound of the fort, which was razed by Ahmad Shah Durrani during one of his invasions in the mideighteenth century. The nearby gate in the city wall constructed by Maharaja Ranjit Singh is also known as Lohgarh Gate.