The PAF aircraft were providing support the Pakistan Army ground units close to the border area in Garibpur. While providing support, the PAF aircraft ended up crossing the Indian border. The first intrusion of four Sabres were picked up in the Jessore area on Indian radar at 0811 hours. No.22 Squadron scrambled four Gnats from Dum Dum. However the Sabres had flown back to their territory by the time the Gnats could make it to Boyra. A second raid by the Pakistanis followed at 1028 hours. An interception again could not be carried out in time and the Sabres were able to escape to safety.