The biggest tank battle of the 1965 Indo-Pak War took place at Phillora in the Sialkot sector at the Battle of Chawinda. During the southern thrust of the Indian Army on the Kaloi-Phillora axis the 17 Horse commanded by Lt. Col. Tarapore advanced on the right flank. On 11 September 1965, the regiment was assigned the task of delivering the main armoured thrust for capturing Phillora. It decided upon launching a surprise attack on Phillora from the rear. To achieve the surprise, when the regiment was thrusting forward between Phillora and Chawinda, it was suddenly counter-attacked by the Pakistani Army's heavy armour from Wazirwali.
Lt. Col. Tarapore defied the Pakistani Army's charge, held his ground and gallantly attacked Phillora with one of his squadrons supported by an Infantry battalion. Though under continuous enemy tank and artillery fire, he remained unperturbed throughout this action. When wounded, he refused to be evacuated. On 14 September 1965, he led his regiment to capture Wazirwali.
Unmindful of his injury, he again led his regiment and captured Jassoran and Butur-Dograndi on 16 September 1965. In this battle his own tank was hit several times. But despite the odds, he maintained his pivots at both these places and thereby helped the supporting infantry to attack Chawinda from the rear.
Inspired by his leadership, the regiment fiercely attacked the enemy armour and destroyed approximately sixty Pakistani Army tanks, suffering only nine tank casualties. However, Lt. Colonel Tarapore was enveloped in flames and died a hero's death. The valour displayed by him in this action, lasting 6 days, was in keeping with the highest traditions of the Indian Army. Lieutenant Colonel Ardeshir Burzorji Tarapore was awarded with the highest war-time gallantry medal, Param Vir Chakra, posthumously. Major Aga Humayun Khan & Major Shamshad of Pakistan Army in their article on Battle of Chawinda,which was published in Defense Journal had described Lt. Col Tarapore as a tough & brave opponent, who inspired & led the 17th Poona Horse bravely throughout the battle.