During the 1965 Indo-Pakistani War in Chhamb-Jaurian in Jammu &amp; Kashmir, the 20 Lancers, equipped with AMX-13 tanks was under command of the 10th Infantry Division. Pakistan's surprise attack on 1 September, Operation Grand Slam, fell on 191 Infantry Brigade which was supported by 'C' Squadron of the regiment, under Maj Bhaskar Roy. The Pakistani armoured attack comprised two regiments, one each of M-48 Patton medium tanks and M-36 Sherman B-2 tank destroyers. The attack began at 0805 hours and was strongly resisted. During the initial phases of the attack, Roy destroyed 6 Pattons, 3 recoilless guns and captured a jeep. A second attack was launched by Pakistani armour at 1100 hours and contested by the AMX-13s of 20 Lancers, which despite being outgunned and outnumbered, destroyed a total 13 tanks that day and prevented the encirclement of 191 Infantry Brigade. The regiment later fought in the defence of Jaurian under 41 Infantry Brigade. For the defense of Chhamb-Jaurian, the regiment was awarded a theatre honour and Maj Bhaskar Roy was awarded Maha Vir Chakra for his leadership in this action.