Ali Musjid.
Watercolour sketch from the disbound album by Lt John Frederick Irwin, 59th (2nd Nottinghamshire) Regiment. Military career and life from RMC Sandhurst 1866 to the 2nd Afghan War (1878-1880).

The fort of Ali Masjid sat upon steep cliffs and was located at the centre of the Khyber Pass, protecting its narrowest point. When the British invaded Afghanistan the Peshawar Valley Field Force, led by Lieutenant General Sam Browne, captured the fort on 21 November 1878 in order to secure British control of the Khyber.