The Battle of Boyra, on 22 November 1971, was an aerial interception fought between the Indian Air Force and intruding Pakistani Air Force jets that had crossed into Indian Airspace. The Pakistani Army was engaged in combat against the Mukti Bahini (Bengali Guerrilla freedom fighters) and a Battalion size detachment of the Indian Army in the Battle of Garibpur as part of the Bangladesh Liberation War. Pakistani ground forces were invariably provided air cover and close air support by F-86 Sabre Jets of the PAF ex Dhaka, whose pilots crossed the Indo-Pak border with impunity. A detachment of four Folland Gnats was moved to Dum Dum (Kolkata Airport) from its parent base at Kalaikunda, near Kharagpur, over 100 km to the Southwest, to deal with such a contingency. The Detachment was commanded