Britain’s Final Plan To Kill Argentina’s Super Étendards Attack Jets
No single Argentine capability shaped British planning during the 1982 South Atlantic conflict more than the pairing of the Dassault Super Étendard strike fighter and its deadly AM39 Exocet anti-ship missile. Against that threat, the British launched a series of special forces operations, all with the same objective: kill the Argentine pilots and destroy their aircraft and missiles before they could be used again. Together, the strike fighter and missile pairing had proven to be the biggest threat to the Royal Navy task force that had been sent to recapture the islands.
Two Super Étendards of the Argentine Navy in flight around the time of the Falklands War in 1982. Photo by UPI/Bettmann Archive/Getty Images
Five Super Étendard aircraft and five AM39 Exocet missiles had been delivered to Argentina before a French embargo took hold. The jets were flown by the Argentine Navy’s 2nd Naval Fighter and Attack Squadron out of Río Grande, on Tierra del Fuego, a region at South America’s southernmost tip, shared by Chile and Argentina. The Super Étendard/Exocet combination had already cost the British the destroyer HMS Sheffield on May 4 and the container ship Atlantic Conveyor on May 25.
A casualty from HMS Sheffield being rushed to the sick bay on board the aircraft carrier HMS Hermes. Crown Copyright
The special forces operations were broken down into four phases — named PLUM DUFF, MIKADO, KETTLEDRUM, and IMPI — the last of which is the least well-documented, and the focus of this article.
PLUM DUFF was the insertion phase and was a reconnaissance mission. On May 16, an RAF Hercules airdropped eight special forces troops onto RFA Fort Austin to form a recce party. On the night of May 17/18, a Sea King HC4, ZA290, lifted off from the aircraft carrier HMS Invincible for a one-way flight to Tierra del Fuego, where the men were to observe Río Grande and report back. The patrol was set down far from the objective and never completed the reconnaissance; the helicopter crew flew on into Chile, where the aircraft was deliberately burnt to try and hide the evidence, while they tried to evade capture.
Commandos being lifted from the decks of HMS Hermes and HMS Invincible to be transferred by Sea King helicopters to other ships while the two aircraft carriers forge ahead to the Falkland Islands from Ascension Island, leaving the marines ready to move at short notice. Photo by Fox Photos/Getty Images
MIKADO was the planned attack phase, and it depended on that missing intelligence. Two Hercules were to air-land up to 70 men of B Squadron, 22 Special Air Service (SAS), directly on Río Grande — the air operation order of May 19 also named Río Gallegos, further up the Argentine coast, as an alternative. The men would destroy the Super Étendards and their Exocets on the ground, kill the pilots, and then withdraw overland into Chile. Commander Task Force 317, at Northwood, accepted from the outset that the mission could well cost both Hercules.
Lieutenant Juan José “Tierno” Rodríguez Mariani in Super Étendard 3-A-203, preparing to take off from Río Grande on May 23, 1982; note the ground power unit still connected. Armada Argentina
The aircrew did not refuse the task, but they were blunt about what it demanded: formation landing by two heavy transports on a possibly heavily defended, icy military runway, with a probable 20-knot tailwind, at night and on passive night-vision goggles in minimum light levels, with intelligence that was inadequate to support any air-land option at all. The RAF planning team recommended an airdrop as the better way to maintain a covert posture, and the Senior Air Staff Officer at Headquarters 38 Group warned the Air Commander to watch for overambitious schemes coming out of the SAS.
The U.K. Ministry of Defense formally cancelled MIKADO on June 4.
KETTLEDRUM was planned as the third of the set. It was aimed at Puerto Deseado, Santa Cruz Province of Argentina, and would have inserted a Special Boat Service party (SBS, the Royal Marines’ special forces unit) from the submarine HMS Onyx — a boat that will reappear before the end of this story.
None of the three was executed as planned.
The Oberon class submarine HMS Onyx on the surface off Ascension Island. HMS Onyx was the only diesel-electric British submarine to serve in the conflict, and its ability to operate silently close inshore enabled it to play an important role. At Ascension Island, Onyx boarded SAS and SBS special forces personnel and supported them during a series of operations. Imperial War Museums via Getty Images
Less well-known is that the cancellation of MIKADO produced a fourth project: Operation IMPI, named after a Zulu fighting force.
Cancelling MIKADO did not mean the wider operation was over. Also on June 4, the U.K. Ministry of Defense tasked CTF 317 to produce a new plan for special forces to destroy the combat effectiveness of the Super Étendards.
CTF 317’s staff went to work on what became IMPI. The planning document, Ops 1/3, is dated June 14 — the day of the Argentine surrender in the islands. In broad terms, the objective was to be attacked by special forces arriving both by air and by sea.
That much has been known, in fragments.
Teniente de Naviro (Lieutenant Commander) Alfredo Astiz signing the Instrument of Surrender on behalf of his Argentine forces at Leith, on the island of South Georgia, on board HMS Plymouth. Crown Copyright
What has not been published until now is the fact that the operation had already been resourced.
At 2240Z on June 12, Maj. Gen. Jeremy Moore, commanding the land forces as CTG 317.1, signalled Rear Admiral Sandy Woodward’s battle group (CTG 317.8), with Admiral Sir John Fieldhouse at Northwood (CTF 317) and Commodore Michael Clapp’s amphibious group (CTG 317.0) as information addressees. The message called for B Squadron, 22 SAS, to be made available for operations as soon as possible: cover was needed against rapid developments of an unfavorable nature in West Falkland (Gran Malvina), and the theatre’s existing s
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