Battle of Chawinda, in the history is the largest tank battle that was fought between the India and Pakistan in 1965. This battle was the part of Sialkot campaign in the war. Indian and Pakistan Armies were standing against each other in this battle that started near Phillora and got intensified. From Indian Army, the commander of Corps I, General Dunn was assigned a group of units. The unites contained six Mountain Divisions, one Armored Division, fourteen Division and twenty-six division. This Indian thrust was opposed by the Pakistani Armed forces consisted of six Armored Division, fifteen Division, and four Crops Artillery. Later, eight Infantry Division and one Armored Division was included by the reinforcements.
The attack was aimed to seize the Grand Trunk Road of Wazirabad that was considered a key Road and captured the Jassoran that would dominate the Sialkot-Pasrur railway that could enable to completely cut off the Pakistani supply line. One Armored Division of Indian 1st Crops was supported by the fourteen Infantry and 6th Mountain Division that was the striking force and on the 7 September they seized the border area. At Jassoran, Pakistan lost its 10 tanks and India dominated completely on Sialkot-Pasrur railway. To support the Pakistani forces, 7 Infantry Division, two regiments of their sixth Armored Division from Chamb rushed to Sialkot.
The majority of Pattons were commanded by the Lt. Col. Nisar who came to Chawinda. Around the village Gadgor, fight between Indian 1 Armored Division and Pakistani 25 Cavalry Regiment stopped the Indian advancement. Indians wanted a hold between Sialkot and 6 Armored Division. Indian 1st Armored Division’s drive quickly divided and supported by the tank regiments. Air attacks from Pakistan caused the moderate damage to the tanks but on the trucks and infantry, a heavier toll was exacted.
On 10 September, Indians resumed their attacks and succeeded in pushing the Pakistani force back to the base line because of their multiple crops sized assaults. Pakistani forces were settled on a defensive position after the repulsion of the Pakistani counterattack at Phillorah. Two Pakistani reinforcements consisting of two independent brigades 8 Infantry Division and 1 Armored Division from Kashmir improved the Pakistani situation. 1st Armored and 6th Mountain Division of India took heavy lose after the repulsion of their assault on 18 September. Indians settled on a defensive position on 21 September.
The United States Security Council on 22 September, to call an unconditional ceasefire from both nations, passed a resolution. The war was ended the following day. Both nations seriously suffered from this battle.