The Battle of Two Sisters was a night attack by British Royal Marines on Argentine positions during the Falklands War. It took place on 11–12 June 1982 on Two Sisters, a ridge with two peaks near Stanley. It was one of three battles fought that night as part of a brigade-sized operation, alongside the Battle of Mount Longdon and the Battle of Mount Harriet. 45 Commando, supported by artillery and by naval gunfire from HMS Glamorgan, attacked Argentine troops from the 4th Infantry Regiment. After hard fighting, especially on the southern peak, the Argentine defenders withdrew. The marines took both peaks, but a planned second advance on Mount Tumbledown was cancelled. Eight British personnel were killed. HMS Glamorgan was hit by an Exocet missile while staying on station to support the marines, and 14 of her crew died. The capture of the high ground opened the way to Port Stanley, and the Argentine forces on the islands surrendered soon after.
Prelude
Composition of forces
The British force, commanded by Lieutenant-Colonel Andrew Whitehead, comprised the Royal Marines of 45 Commando, supported by the anti-tank troop from 40 Commando and six 105 mm guns of 29 Commando Regiment. The 2nd Battalion, Parachute Regiment (2 Para) was held in reserve. Naval gunfire support was provided by the twin 4.5-inch (114 mm) guns of HMS Glamorgan.
45 Commando was instructed to seize Two Sisters Mountain under cover of darkness, and to continue onto Mount Tumbledown if time permitted. However, Argentine resistance proved stiffer than anticipated, and the second phase of the attack was cancelled.
The Argentinian force originally occupying Mount Challenger was commanded by Major Ricardo Cordón and consisted of the 4th Infantry Regiment or RI 4. The bulk of the defenders were drawn from C Company, with the 1st Platoon (Sub-Lieutenant Miguel Mosquera-Gutierrez) and 2nd Platoon (Sub-Lieutenant Jorge Pérez-Grandi) positioned on the northern peak of Two Sisters, and the 3rd Platoon (Sub-Lieutenant Marcelo Llambías Pravaz) on the southern peak. The 1st Platoon of A Company (Sub-Lieutenant Juan Nazer) and the Support Platoon (Second Lieutenant Luis Carlos Martella) were located on the saddle between the peaks.
Major Óscar Jaimet’s B Company of the 6th Mechanized Infantry Regiment or RI Mec 6, acted as the local reserve, and occupied the saddle between Two Sisters and Mount Longdon. In early June, Jaimet’s company was reinforced by the Support Platoon under Second Lieutenant Marcelo Dorigón, drawn from B Company of the 12th Regiment (RI 12). This platoon had remained on Mount Kent after the rest of B Company had been helicoptered forward during the Battle of Goose Green.
No-Man's-Land
On 2 June, the 4th Regiment's Operation Officer, Captain Carlos Alfredo López-Patterson, arrived to help in the defence of Two Sisters. He would visit the rifle platoons in order to maintain the defenders informed and raise morale:
In those visits, one thing that always moved me was that, while I saluted Second Lieutenant Llambias Pravaz, the soldiers in that platoon would clap and they cheered. It must have been because they noticed that I was recognizing the valour they were acquiring in that place. Because they were very isolated, waiting for the enemy, just them and their souls. Or, perhaps, because seeing their commander who is going to share a few words - a brotherly gesture of a young man towards other young people - they felt their desire revived to fight. One day, a lad approached me and said "Since we have got to dance in this one, we are going to do it well. We are going to support the Second Lieutenant who has fallen sick and still remains with us. We have got to help the one whose feet get cold or the one who freaks out. Because from here we all leave together or no one leaves at all". What could I say?
On 4 June, the three rifle companies of 45 CDO advanced on Bluff Cove Peak, on the lower slopes of Mount Kent, and were able to occupy the feature without opposition and were met by patrols from the Special Air Service (SAS). On the night of 29 May, a fierce firefight had developed over capturing the two important hills, as they were intended to form part of an Argentine Special Forces line.
Captain Andrés Ferrero's patrol (3rd Assault Section, 602 Commando Company) reached the base of Mount Kent but were then promptly pinned down by machinegun and mortar fire. First-Sergeant Raimundo Máximo Viltes was badly wounded when a bullet shattered his heel. Air Troop had two SAS men wounded by rifle fire.
Two SAS men had been flown in with gunshot wounds that were quite obviously more than 24 hours old. We knew better than to ask them about the circumstances of their injuries, and instead simply operated on them. The anaesthetist, Malcolm Jowitt, used Ketalar, in injectable and steroid-based general anaesthetic that had some occasional and highly interesting side effects. One of the SAS men, a big ex-Sapper, came from round his op and started singing bawdy rugby songs, quite tunefully, at the top of his voice!
Probing attacks around the D Squadron, SAS positions continued throughout the night and at 11:00 am local time on 30 May, about 12 Argentine Commandos (Captain Tomás Fernández's 2nd Assault Section, 602 Commando Company) tried to get up the summit of Bluff Cove Peak, but were driven off by D Squadron who killed two of the attackers, First Lieutenant Rubén Eduardo Márquez and Sergeant Óscar Humberto Blas.
First Lieutenant Márquez and Sergeant Blas had shown great personal courage and leadership in the contact and were posthumously awarded the Argentine Medal of Valour in Combat. During this contact, the SAS suffered another two casualties from grenades after the Argentine Commandos had stumbled on a camp occupied by 15 SAS troopers.
Suddenly there was a burst of firing, and the distinct crack of at least one grenade going off ... One of the blokes took splinter wounds from the grenade in his back and was brought up to our position to be looked after ... The other casualty's shrapnel wounds were unpleasant but not serious.
Throughout 30 May, Royal Air Force Harriers were active over Mount Kent. One of them, responding to a call for help from D Squadron SAS, was badly damaged by small arms fire while attacking Mount Kent's eastern lower slopes. Sub-Lieutenant Llambías-Pravaz's platoon was later credited with the destruction of Harrier XZ963 flown by Squadron Leader Jerry Pook with another claim going to 35 mm Oerlikons of the 601st Anti-Aircraft Artillery Group under the command of 2nd Lieutenant Roberto Enrique Ferre.
"During another action, an enemy aircraft fell victim to the 601 Air Defence's 35mm batteries. The plane came down in the water and the pilot, Squadron Leader Pook was rescued shortly after."
The Harrier crashed into the South Atlantic 30 miles from the carrier HMS Hermes, Squadron Leader Pook ejected and was rescued.
On 5 June, two Royal Air Force Harriers operating from 'Sids Strip', the San Carlos Forward Operating Base, attacked the Argentine defenders on Two Sisters with rockets around midday.
The two GR3s remained until 11.30 am when they took off to rocket Argentine troops positions on Two Sisters.
A heavy mist hung over the Murrell River area, which assisted the 45 Commando Recce Troop to reach and sometimes penetrate the Argentine 3rd Platoon position under Subteniente Marcelo Llambías-Pravaz. Marine Andrew Tubb of Recce Troop later recalled:
We were actually inside the Argentine position, so we ended up shelling ourselves. We did a lot of patrols up to Two Sisters ... that time [6 June] we pepper-potted [fire and maneouver] for about 400 metres to get out the 3rd Platoon Sergeant, Juan Domingo Valdez, had launched a counter-ambush., through the Argy lines, firing 66mm rockets to fight through and regroup. We got artillery again to smoke us out. It took us well over an hour to get away and it seemed like a few minutes. We killed seventeen of them, and all we had was one bloke with a flesh wound.
(2 Army privates, Jose Romero and Andres Rodriguez and three sappers of a Marine mine-laying party were actually killed.)
For his patrol action, Lieutenant Chris Fox received the Military Cross, while Subteniente Llambías-Pravaz was able to pilfer and sport a Commando Beret that the Royal Marines had left behind during the Argentine counter-ambush.
In general terms, the Argentines were thoroughly entrenched, about 6,000 metres or less across no-man's-land. The Argentine positions were mined and heavily patrolled.
The 4th Regiment also carried out patrolling, and on the night of 6–7 June, Corporal Oscar Nicolás Albornoz-Guevara along with eight conscripts (including Private Orlando Héctor Stella, his pathfinder) from Subteniente Miguel Mosquera-Gutierrez's 1st Platoon crossed Murrell River and reached the area of Estancia Mountain where they detected a number of British vehicles, but the patrol soon came under mortar fire from 3 PARA and had to withdraw.
On 8 June, Corporal Hugo Gabino MacDougall of B Company, 6th Regiment, claimed to have shot down a Harrier using a shoulder-launched Blowpipe missile. The British confirm the loss of a GR.3 Harrier (XZ989) on that day, following an emergency landing at San Carlos due to battle damage. The pilot, Wing Commander Peter Squire walked away uninjured and XZ989 was scrapped post-war.
Harrier GR.3 XZ989 was stripped for spares and repatriated to the UK. In March 1983, it was assessed as beyond economical repair and allocated for ground-instructional duties at RAF Gütersloh in West Germany. The airframe was later scrapped following the closure of RAF Gütersloh in 1993.
The 12th Regiment Support Platoon under Subteniente Dorigón attached to Major Oscar Jaimet's B Company would reportedly live off the land. Private Ángel Ramírez:
We ate raw sheep, we would butcher sheep and place it on flames. You know that the soil in the Malvinas Islands is like coal, it is black turf, you dig a hole, light a fire, and it is all like petrol, everything burns. We ate barbecued sheep, we ate it half raw and cooked.
Major Jaimet says he made sure the conscripts in his rifle company got enough meat for he authorized his men to shoot and butcher sheep and fry their edible remains over camp fires among the boulders behind British view.
At about 2.10 am local time on 10 June a strong 45 Commando fighting patrol probed the 3rd Platoon position. In the ensuing fight, Special Forces Sergeants Mario Antonio Cisneros and Ramón Gumercindo Acosta were killed; two more Argentine Special Forces lying in ambush for the Royal Marines were wounded. The British military historian Bruce Quarrie later wrote: