Mount Longdon to Stanley 11–14 June 1982: Complete Final Battles Field Guide // Log 013

East Falkland, 11–14 June 1982. By mid-June the British land force had crossed the island and was facing the last major Argentine defensive belt west of Stanley. On a campaign map the final phase can look simple: take the mountains, enter the town, end the war. On the ground, every ridge was a separate night battle.

I served 12 years with The Royal Welsh as a mortarman and fired operational fire missions in Afghanistan. The final Falklands battles are particularly interesting from that perspective because they show what happens when reconnaissance, artillery, mortars, naval gunfire, armour, night movement and infantry assault are deliberately brought together. The ground still controls the fight, but the supporting-fire system is far more developed than it had been at Goose Green.

For the political road to the war, read Log 009. For the full campaign from invasion to San Carlos and the advance east, read Log 010.

At a glance

• First phase: night 11–12 June — Mount Longdon, Two Sisters and Mount Harriet.
• Second phase: night 13–14 June — Wireless Ridge and Mount Tumbledown, with Mount William and Sapper Hill forming part of the wider plan.
• British land commander: Major General Jeremy Moore RM.
• 3 Commando Brigade: Brigadier Julian Thompson RM.
• 5 Infantry Brigade: Brigadier Tony Wilson.
• Argentine commander: Brigadier General Mario Menéndez.
• Operational purpose: break the defensive mountain belt west of Stanley and make continued defence of the capital untenable.
• Result: British seizure of the key heights; Argentine withdrawal; surrender on 14 June.

Why the mountains mattered

Stanley sits behind a chain of high ground. From west to east, features such as Mount Longdon, Two Sisters, Mount Harriet, Mount Tumbledown and Wireless Ridge offered observation, defensive depth and positions from which artillery and mortar fire could be directed.

That does not mean each mountain was a fortress in isolation. The defensive value came from the system. A position on one feature could observe routes towards another; artillery behind the line could support several sectors; minefields and rocky ground restricted the attacking routes; and the loss of one ridge changed the tactical value of the next.

Events leading up to the final assault

The British had established the San Carlos beachhead on 21 May and won the battle of Goose Green on 28–29 May. Other formations moved east through Teal Inlet, Estancia and Mount Kent while 5 Infantry Brigade developed a southern route through Fitzroy and Bluff Cove.

The 8 June attacks on RFA Sir Galahad and Sir Tristram badly damaged 5 Brigade’s immediate capability and killed dozens of British personnel. Moore reorganised the land force and gave particular attention to the final fire plan.

This is a major difference from Goose Green. British commanders now had time to patrol, identify positions, move artillery ammunition forward and coordinate naval gunfire. The final assault would be made at night and supported by a much denser fire system.

British order of battle: first phase, 11–12 June

3 Commando Brigade

• 3 PARA — Lieutenant Colonel Hew Pike: Mount Longdon.
• 45 Commando Royal Marines — Lieutenant Colonel Andrew Whitehead: Two Sisters.
• 42 Commando Royal Marines — Lieutenant Colonel Nick Vaux: Mount Harriet.
• 29 Commando Regiment Royal Artillery: 105 mm Light Guns supporting the brigade attacks.
• Naval gunfire: warships allocated to support individual objectives.
• Engineers, mortars, machine guns, MILAN and other support weapons integrated into battalion plans.

Argentine defensive system

The western approaches to Stanley were held by units of the Argentine Army and Marines, supported by mortars, machine guns, artillery, anti-aircraft weapons and minefields.

• 7th Infantry Regiment: major responsibility for the Mount Longdon/Wireless Ridge sector.
• 4th Infantry Regiment: defended positions including Mount Harriet and Two Sisters sectors alongside other elements.
• 5th Marine Infantry Battalion (BIM 5): a well-trained Argentine Marine unit occupying Tumbledown, Mount William and the Sapper Hill area.
• Artillery: 105 mm and heavier guns around Stanley provided support to the mountain positions.

Exact sub-unit locations changed during the fighting and differ between reconstructions. The useful tactical picture is of a defended arc rather than a row of independent hilltop outposts.

Mount Longdon: 3 PARA

Mount Longdon is a narrow, rocky feature with multiple crests, bowls and dead ground. 3 PARA had patrolled towards it from Estancia and expected a substantial Argentine defence.

Lieutenant Colonel Hew Pike’s plan used B Company along the principal ridge and A Company on the northern side, with C Company in reserve. The battalion crossed its start line after midnight on 12 June.

Surprise was compromised when British soldiers entered a minefield and an explosion alerted the defenders. Fighting became close, confused and violent. Argentine machine-gun and rifle positions were difficult to identify among rocks and folds in the ground.

Sergeant Ian McKay took command of his platoon after casualties among its leaders and attacked a machine-gun position that was holding up the advance. He was killed and later awarded the Victoria Cross posthumously.

By late morning the mountain had been taken, but the battalion then remained under heavy Argentine artillery and mortar fire from positions farther east. This is an important point: capturing a crest does not end the battle if the enemy still has observation and guns able to engage it.

3 PARA lost 23 men killed, including attached personnel, and dozens wounded. It was the costliest single ground battle of the campaign for the British.

“We moved with full scales of ammo but in ‘light’ order.”

Hew Pike’s later account of the approach is useful because it cuts through the word “yomp”. Even when bergens were reduced, signallers, medics and support-weapon teams still had to move everything necessary to fight and communicate.

Read Hew Pike’s full account at the Airborne Assault Museum →

Two Sisters: 45 Commando

45 Commando attacked Two Sisters in the same brigade operation. The feature consists of distinct high points and broken approaches that required separate company objectives.

The commando had already made the long cross-island movement from San Carlos. At Two Sisters, night movement, supporting artillery and aggressive company attacks gradually forced the defenders from the ridge.

The battle was not as costly as Longdon, but it was still close infantry fighting on steep, exposed ground. The significance of taking Two Sisters was not simply possession of the mountain; it opened approaches towards the inner defensive line and protected neighbouring units from fire and observation.

Mount Harriet: 42 Commando

42 Commando’s attack on Mount Harriet is often cited as one of the more tactically accomplished British battalion actions of the campaign. Extensive patrolling allowed the commando to identify Argentine positions and approach from a direction the defenders did not expect to be the main threat.

Rather than driving straight into the strongest face, the attack worked around the flank and used artillery and naval gunfire to isolate the objective. By morning the position had been overrun and hundreds of prisoners taken.

The lesson is not that one battle was “easy”. It is that reconnaissance can buy options. Knowing enough about the ground and enemy layout allowed 42 Commando to choose geometry rather than simply accept the obvious axis.

12 June: HMS Glamorgan

The supporting naval battle did not stop once the troops reached the mountains. In the early hours of 12 June, HMS Glamorgan, withdrawing after naval gunfire support, was struck by an Exocet missile launched from an improvised Argentine land-based system.

The hit killed members of the ship’s company and badly damaged the ship. It was another reminder that the fleet remained exposed while providing artillery-like support to the ground force.

Why the British paused for a night

After the outer objectives fell, Moore wanted momentum. But 5 Infantry Brigade’s troops were not yet in a good enough condition to launch the next phase immediately. Brigadier Wilson requested time for reconnaissance, ammunition concentration and preparation.

The delay matters because it demonstrates disciplined tempo. Momentum is not the same as speed. Attacking too quickly with troops who have not seen the ground, artillery that is not ready and ammunition that has not arrived can destroy the advantage created by the previous success.

Second phase: 13–14 June

Wireless Ridge — 2 PARA

Wireless Ridge was the next major feature on the northern approach to Stanley. 2 PARA, now under Lieutenant Colonel David Chaundler after Goose Green, was given significantly stronger support than the battalion had received in its first battle.

The fire plan included two batteries of 105 mm artillery, battalion and supporting mortars, naval gunfire from HMS Ambuscade, and Scorpion and Scimitar light armour from The Blues and Royals.

This density of support changed the tactical problem. Argentine positions were hit repeatedly before and during the assault, while the light armour’s night sights helped identify targets. The battalion moved across successive ridge lines and broke the defence.

2 PARA lost three men killed and eleven wounded. Whatever comparisons are made with Goose Green, the important point is not that supporting fire guarantees low casualties. It is that concentrated, observed fire can reduce the freedom of defenders and give assaulting infantry more opportunities to manoeuvre.

Mount Tumbledown — 2nd Battalion Scots Guards

Tumbledown was one of the strongest positions in the inner defensive line and was held principally by 5th Marine Infantry Battalion. Argentine Marine sources emphasise the preparation, discipline and determination of the defending companies.

The Scots Guards attacked on the night of 13–14 June after a diversion and supporting fires. The main assault worked along the rocky feature in difficult weather and developed into close fighting.

Major John Kiszely’s Left Flank Company became heavily engaged as it worked across the mountain. Argentine positions were mutually supporting and the ground repeatedly hid the next line until the attackers were close.

British and Argentine accounts both describe hard hand-to-hand and short-range fighting. The Scots Guards lost nine killed and more than forty wounded. BIM 5 also suffered significant casualties before withdrawing under orders as the overall defensive position deteriorated.

Mount William and Sapper Hill

1/7th Duke of Edinburgh’s Own Gurkha Rifles were intended to exploit towards Mount William, while the Welsh Guards had tasks in the southern sector towards Sapper Hill. The timing of the Tumbledown fight and daylight complicated those plans.

Argentine forces around Sapper Hill remained capable of resistance even as the wider line collapsed. Argentine official histories describe BIM 5 preparing counter-attacks before receiving orders to stop and withdraw as ceasefire negotiations developed.

Argentine perspective: 5th Marine Infantry Battalion

A serious account of the final battles has to treat BIM 5 as more than an anonymous defending force. The battalion occupied Tumbledown, Mount William and Sapper Hill and maintained organised resistance late into the campaign.

Argentine Ministry of Defence accounts describe Nacar Company bearing much of the Tumbledown fighting, supported by mortars and reinforcement from Army units. Their narrative also records plans for local counter-attacks before higher command ordered withdrawal and cessation as the defence of Stanley became untenable.

That perspective matters because a surrender at campaign level does not mean every company on the ground had already been physically destroyed. Menéndez’s decision was based on the total operational picture: key heights lost, British artillery dominating approaches, units withdrawing towards Stanley, limited options for reinforcement and a growing risk of fighting inside the town.

The final morning: 14 June

As daylight came, British observers saw Argentine troops streaming back towards Stanley. Units began following up while artillery continued to dominate movement beyond the captured ridges.

White flags appeared and formal contact developed. Menéndez eventually met Moore and agreed the surrender of Argentine forces in the islands.

The Falkland Islands National Archives preserves the surrender instrument, which required Argentine personnel to assemble, disarm and hand over military equipment while being treated under the Geneva Convention.

Key personalities

Major General Jeremy Moore RM: Commander Land Forces. Moore had to turn two brigades, imperfect transport, limited weather windows and a complicated command structure into one coherent final attack.

Brigadier Julian Thompson RM: 3 Commando Brigade commander. His formations conducted the northern advance and the first phase of the mountain assault.

Lieutenant Colonel Hew Pike: commander of 3 PARA at Mount Longdon. His first-hand account is one of the best sources for the approach, plan and experience after the objective was taken.

Lieutenant Colonel Michael Scott: commander of 2nd Battalion Scots Guards at Tumbledown.

Brigadier General Mario Menéndez: Argentine military governor and commander in the islands. By 14 June he had to judge not an individual hill but whether the whole defensive system could continue.

Captain Carlos Robacio: commander of Argentine 5th Marine Infantry Battalion, whose unit defended the Tumbledown–Mount William–Sapper Hill sector.

First-hand voices and battlefield evidence

Hew Pike’s account of Longdon describes a battalion that had already crossed East Falkland, fought through a night objective and then endured another day and a half of accurate shelling. That period after the “victory” is essential to understanding the cost.

Argentine accounts of Tumbledown describe officers preparing counter-attacks even as other parts of the defensive system were failing. British accounts describe exhaustion, rocky ground, close-range firing and difficulty identifying exactly where the next position began.

Read together, the accounts strip away the clean arrows on a map. A commander may know the objective is “Mount Tumbledown”; a section commander sees only the next rock line, tracer, casualty and order.

What I notice through a mortarman’s lens

The fire plan had matured. By 11 June, British commanders had artillery ammunition, naval gunfire and mortars deliberately integrated with night attacks. That is very different from simply having guns somewhere behind you.

Observation decided effect. Argentine observers on Tumbledown were able to direct punishing fire onto Longdon after the mountain was captured. A position can be lost tactically while still influencing the battlefield through observation.

Masking and crest lines mattered constantly. Rocky ridges created dead ground for attackers and defenders. Mortars are useful precisely because they can reach into some of that hidden ground, provided the observer and communications chain are working.

Ammunition had to be physically moved forward. Nearly every discussion of the final fire plan eventually becomes a logistics story. Guns cannot support repeated attacks on intention alone.

Night changes the relationship between fire and manoeuvre. Darkness reduced some Argentine observation but made navigation, control and target identification harder. The best-prepared attacks used reconnaissance to reduce that uncertainty before H-hour.

Casualties and outcome

The final mountain battles added heavily to the human cost on both sides. 3 PARA lost 23 killed at and after Longdon; the Scots Guards lost nine killed on Tumbledown; other units also suffered dead and wounded at Two Sisters, Harriet, Wireless Ridge and associated actions. Argentine units suffered significant casualties and large numbers were captured or withdrew into Stanley.

Exact Argentine battle-by-battle totals differ between sources, partly because men moved between features and some casualties were recorded at unit rather than objective level. Gallus does not force a false single number where the source record is genuinely inconsistent.

Operationally, the result was decisive. Once the outer and inner mountain lines were broken, Stanley could not be defended on the same terms. Menéndez surrendered on 14 June and organised fighting in the islands ended.

Wear the history

• Mount Longdon 1982 T-Shirt — Falklands War Heritage
• Port Stanley 1982 T-Shirt
• East Falkland 1982 Map T-Shirt
• Falkland Islands 1982 Map T-Shirt

Browse the full Falklands War collection.

Sources & further research

• National Army Museum — The British Army and the Falklands War
• Airborne Assault Museum — Mount Longdon battle record
• Hew Pike — first-hand account of Mount Longdon
• Royal Navy — 45 Commando and Two Sisters
• Royal Navy — 42 Commando and Mount Harriet
• Argentina Ministry of Defence — Argentine account of the final battles
• Falkland Islands National Archives — surrender instrument
• Naval-History.Net — Mount Longdon forces and supporting fire
• Julian Thompson, No Picnic; Martin Middlebrook, The Falklands War, 1982; Lawrence Freedman, The Official History of the Falklands Campaign, Volume II.

I reconstruct the final battles by comparing unit histories, British first-hand accounts, Argentine official material, contemporary records and modern battlefield research. Where casualty totals or precise sub-unit locations differ, I say so rather than hide the uncertainty.