In the run up to the 1971 India Pakistan war, some local skirmishes and battles had begub towards the end of November. One such battle was being fought at Garibpur, between the Pakistan army on one side, an the 'Mukhti Bahini' (the libration army of Bangladesh) and a small detachment of the Indian Army.
The Pakistan Air force dispatched four fighter aircraft to lend support to the Paksitan army in Garibpur. These aircrat were intercepted by four Gnat aircraft of the No. 22 squadron, of the Indian Air Force. 
The air battle that ensued came to be known as the Battle over Boyra. Listen in to know what happened,