Pakistan launched Operation Grand Slam on 17 August 1965 in an effort to relieve infiltrators who had been surrounded after the failure of Operation Gibraltar on 15 August and to attempt to cut off the Indian supply lines. With supply lines under severe stress due to Operation Grand Slam, India launched an offensive towards Lahore to open up a second front in the war and distract Pakistani attention from Kashmir. After opening the Lahore front, Indian troops advanced towards Lahore along three axes—Amritsar-Lahore, Khalra-Burki- Lahore and Khem Karan-Kasur roads—overwhelming the small Pakistani force.