Here's the BBC story from Sept 1965 on Indian military invasion of Pakistan:
1965: Indian Army invades W Pakistan
Indian troops have invaded West Pakistan, crossing the border at three points in an attack which appears to be aimed mainly at the city of Lahore.
Authorities in Delhi say their action was intended to prevent a direct attack by Pakistani forces against India.
On 25 August, Pakistani soldiers launched a covert operation across the ceasefire line, established in 1949 after the first Indo-Pakistani war, into Indian-administered Jammu and Kashmir.
Since then there have been a number of clashes along the ceasefire line, but this is the first time Indian troops have crossed into West Pakistan in what is being seen as an act of war.
Air attacks
Since the first Indo-Pakistan war, both countries have continued to lay claim to the entire state of Kashmir. Currently Pakistan controls the smaller, northern sector of Azad Kashmir and the remaining area of Jammu and Kashmir, known commonly as Kashmir, is held by India.
Details of today's invasion are sketchy. There have been reports of the Indian Air Force in action, striking against military targets, including an oil tanker train, a group of military vehicles, a goods train carrying supplies, an army camp and some gun positions.
A spokesman for the Indian government said: "Our policy is that when Pakistan has bases from which it is mounting attacks on our territory we have to destroy those bases."
The Defence Minister Yashwantrao Chavan blamed recent attacks by Pakistani forces for the invasion.
Although there have been a number of air attacks against Indian installations in Punjab, these seem to have been mostly by single aircraft.
But Mr Chavan said: "It was quite apparent Pakistan's next move was to attack Punjab across the international frontier."
Reports from the Pakistani city of Karachi say forces have beaten back the Indian Army from Lahore.
They said advances at the border towns of Jasar, Wagah and Bedian had all been "fully stopped".
Pakistani officials say the number of Indian dead in the Lahore sector is 800, their own casualties are reported to be "very light".
The Pakistani President Ayub Khan has made an emergency broadcast to the nation saying, "We are at war".
He said the Indian attack was proof of the evil intentions which India had always harboured against Pakistan.
Reports from Delhi say Pakistani paratroopers have landed in the Punjab. Small groups have dropped in three places, Pathankot, Patiala and Ambala in an apparent attempt to damage military installations.
BBC ON THIS DAY | 6 | 1965: Indian Army invades W Pakistan
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