A flight of F-6s (Chinese built Mig-19s) from No 11 Squadron was on a search and destroy mission over the Shakargarh salient when Flight Lieutenant Aamer Ali Sharieff spotted four manoeuvring Mig-21s, much superior in performance to Aamer's F-6. Quickly sliding into the blind zone of the trailing Mig-21, Aamer launched his Sidewinder. The Mig-21 burst into flames and crashed.