CALCUTTA, India, Dec. 4— The objective of India's land and‐air invasion of East Pakistan is the full surrender of the Pakistani forces there and the establishment of the insurgent Bangla Desh (Bengal Nation) Government, Indian officials made clear today.

“My aim is to make the Pakistan armed forces surrender,” Lieut. Gen. Ajit Singh Aurora, chief of the Eastern Command, said at a briefing for newsmen this morning, and “to get Bangla Desh to have their own type of government.”

General Aurora—relaxed and confident though not cocky — said that Indian Air Force jets had launched attacks on several Pakistani airfields in East Pakistan, including the two in Dacca, the capital. Later Government reports said that Indian planes had shot down seven of the remaining 20 Pakistani jet fighters in East Pakistan—4 near Dacca and 3 near Jessore.

The reports also listed “probables.”

The Pakistani planes are American‐supplied F‐86 Sabre jets.

Air‐and‐Sea Blockade

The Government reports also said that an air‐and‐sea blockade had been set up to prevent the Pakistani troops in East Pakistan from being resupplied or reinforced from West Pakistan—which is more than 1,000 miles away across Indian territory.

The Indians ordered the invasion of East Pakistan in retaliation for the reported surprise attacks by Pakistani planes on Indian airfields last night. Pakistan contends that the Indians attacked first—on the ground along the border with West Pakistan.

The Indian invasion is the climax of eight months of border tension that began March 25, when Pakistan's troops tried to crush the Bengali autonomy movement, which had won a national majority in last year's elections.

Over the months, India had steadily increased her military assistance to the Mukti Bahini or Liberation Forces — the Bengali insurgent group formed when the army action began — to the point where in recent weeks Indian troops provided the insurgents with direct combat support, crossing into East Pakistan in “defensive actions.”

To Unify Commands

General Aurora, bearded and turbaned in the traditional Sikh manner, insisted that the Indian Army had given no assistance to the Mukti Bahini in the past, but said his troops would now link up with the insurgents and form “a unified command.”

The general conducted his briefing in an army office in downtown Calcutta, a city which — though it is only about 50 miles from the fighting — is almost unnaturally oblivious and relaxed. Calcutta's only concession to the war is the blackout that was imposed, beginning tonight.

General Aurora said that his mission was to force the surrender of the Pakistani troops in East Pakistan “as quickly as possible” and that “the only limitation” the Government had placed on the offensive “is not to cause unnecessary damage to the infrastructure of Bangla Desh, which I think is quite right.”

“Otherwise,” he said, “how far I go, what I consider an objective, where I fight, has been left up to me.”

The 54‐year‐old general, who was born in Jhelum in what is now West Pakistan said that since the offensive began only last night, after the Pakistani air attacks, he had not made any “major moves” yet on the ground. He said he was putting large numbers of troops into East Pakistan — “a brigade group here, a brigade there,” — to get ready for some big pushes, which he indicated would take place over the next two or three days.

He gave few details about his plans except to mention three areas where he had put troops in — the Hilli area in northwest East Pakistan, the Jessore area in the southwest and the area in the east bordering India's Tripura Territory.

The general said that since his moves so far were “preliminary,” the fighting as yet had not been major or “fierce.” But he described it as “good fighting.”

“The Pakistanis have fought well,” he said, “and I'm very proud of the way my chaps have done.”

He said he had no figures yet on casualties on either side.

He declined to say whether he was making a major drive on Jessore — an extremely strategic target because one of the East Pakistani's three largest military cantonments is located there. Jessore is less than 15 air miles from the border point. At Boyra, where the Indian troops pushed in, General Aurora said his men had already moved three miles in side.

Asked about the Pakistani resistance, he said “it is really no more nor no less than it was in the last two days.”

Other Eastern‐Command officials said that the drive from Boyra, which started last night, involved two brigades and, that a related push, about 25 miles north, around Darsana, involved one brigade.

Troop Strength Undisclosed

General Aurora, whose Eastern‐Command forces have been in position around the East Pakistan border for some time, declined to say how many Indian troops were involved in the offensive.

The Indians are believed to have had at least seven divisions—plus some independent units—poised around East Pakistan. This would amount to more than 125,000 men. The general said the Pakistanis had about 70,000 to 80,000 troops inside East Pakistan.

Asked about the Indian air attacks, the general said the Indian jets, which he said were British Hunters, had raided the two airfields at Dacca and “have also visited other airfields because they are looking for aircraft.”

He added that “we are not trying to attack runways, which are repaired so quickly there is no point in damaging them.”

However, authoritative information reaching Calcutta from diplomatic sources in Dacca said that the Indian raids had blown some “big holes” in the runway at the capital's main airport.

These sources also reported that the air raids started in the pre‐dawn hours and were still going on at 11 A.M. The city's air‐raid siren went off twice during the night, these sources said, and the sound of anti aircraft and small‐arms fire could be heard. The sources said they also heard a “big explosion.”

Cities Not Prime Objective

General Aurora was also asked if he intended to take Dacca and the other big cities. “My aim,” he said, “is not to take a particular town but to get the surrender of the Pakistani forces.”

Asked if he was “pleased” with the way the operation was going, the general said, “a soldier is always pleased to get a chance to exercise his professional skill.”

Like so many officers in the Indian Army, General Aurora knows the enemy extremely well from the days when they all served together in the British Indian Army before the 1947 partition. He said that both the Pakistani President, Agha Mohammad Yahya Khan, who is also army commander, and Gen. Hamid Khan, the Pakistan Army chief of staff, were classmates of his at the Indian military academy at Dehra Dun.

“What kind of a man was Yahya?” a newsman asked.

“He was a good officer,” the general replied, “but I won't say he's a good President.”