The location chosen for building the fortification was in the Delhi plains, with an elevation ranging between , bordered by the Yamuna River on one side and the northern spur of the
Aravalli range on the other. This topography—with exposed rock formations at the fort site, proximity to the northeast-trending ridge, and alignment with the
Jama Masjid—was seen as ideal for protection against erosion by the Yamuna. Moreover, the combination of a river on one side and a mountain ridge on the other provided a natural defensive barrier, compelling any invading force to follow the river course. Considering these strategic advantages, Salimgarh Fort was constructed in 1546. from Salimgarh Fort, with the railway bridge in the background During British rule, the
Indian Rebellion of 1857, which was eventually suppressed by 1858, led to significant activity at the fort. The last Mughal emperor,
Bahadur Shah Zafar II, was taken prisoner at Humayun's Tomb. During the rebellion, Salimgarh Fort became a centre of wartime operations. From the British perspective,
Bahadur Shah Zafar's "complicity with the mutinous soldiers was obvious." He is said to have operated from this fort and convened meetings in August and early September 1857 to discuss war strategy. He reportedly observed artillery fire against the
British Indian Army from the fort's ramparts. On one occasion, when approached by army officers requesting their salaries, he made a symbolic gesture by offering to pawn his crown jewels and even sacrifice his life for the cause. The officers declined his offer, trusting the Emperor's sincerity. Subsequently, proclamations were issued declaring that the Emperor would lead an assault against the British and urging people of all castes and creeds to join the resistance. By mid-September 1857, however, British troops were advancing on the fort. At that point, Bahadur Shah's trusted aide, Bakht Khan, advised him to retreat and prepare for guerrilla warfare in the open countryside. The Emperor, however, refused to flee. While he permitted his forces to evacuate, he himself relocated to Humayun's Tomb. The British Fourth Infantry eventually entered Salimgarh Fort through a single entry point. Similar circumstances were reported when the
Punjab Fourth
Infantry Regiment had earlier entered the Red Fort via the
Lahore Gate. After the rebellion was quelled, the British initially used Salimgarh Fort as a military camp, housing
artillery units. From 1945 onwards, it was repurposed as a penitentiary to hold prisoners of the
Indian National Army (INA). ==Structure==