The Berlin Blockade (June 1948 to May 1949) and Airlift, the formation of NATO (April 1949), and the division of Germany into the Federal Republic (May 1949) and the German Democratic Republic (October 1949)

A 15-mark "why" with "consequences" needs causal explanation and an evaluation of outcomes.

Why the blockade was imposed

The Western Allies announced currency reform (the Deutsche Mark) on 18 June 1948 and extended it to West Berlin on 23 June. Stalin imposed the blockade on 24 June 1948 to compel the West to abandon the new currency, reverse Bizonia, and ideally evacuate Berlin.

Why the blockade failed

The Airlift (Operation Vittles, RAF Operation Plainfare) flew supplies into Tempelhof, Gatow, and Tegel airports through three 20-mile air corridors guaranteed by the November 1945 air agreement. At peak (Easter Parade, 16 April 1949) one aircraft landed every 30 seconds. Over 277,000 flights delivered 2.3 million tonnes of supplies, including 1.5 million tonnes of coal. Stalin would not shoot down unarmed transports and risk war. He lifted the blockade on 12 May 1949.

Consequences

The Federal Republic of Germany was proclaimed on 23 May 1949 and the German Democratic Republic on 7 October 1949. NATO was signed on 4 April 1949. American B-29 bombers (publicly described as atomic-capable, though not initially armed) were stationed in Britain. Western European public opinion accepted long-term American military presence. The Cold War became militarised.

A 3-mark "outline" wants a short causal chain with dates, not a narrative of the whole crisis.

The reform

On 18 June 1948 the Western Allies replaced the inflated Reichsmark with the Deutsche Mark in their zones, then extended it to West Berlin on 23 June.

The Soviet objection

A separate Western currency made the division of Germany concrete and threatened the Soviet zone's economy; the Soviets issued their own Ostmark in reply.

The blockade

On 24 June 1948 the Soviets closed the rail, road and canal links to West Berlin, aiming to force the West to drop the new currency or abandon the city.

Marking criteria

1 mark for the Deutsche Mark and its extension to West Berlin (with date); 1 mark for why it provoked the Soviets; 1 mark for the closure of surface links on 24 June.

A 4-mark "explain" needs reasons linked to outcome, with specific evidence.

Logistics and organisation

Three guaranteed air corridors (the November 1945 agreement) gave legal access; General Tunner's strict timing - aircraft minutes apart, one approach, no holding - pushed deliveries past the 4,500-tonne daily survival minimum to a peak of 12,941 tonnes on 16 April 1949.

Scale

About 277,000 flights delivered 2.3 million tonnes, including 1.5 million tonnes of coal, sustaining roughly 2.5 million West Berliners through the winter.

Soviet restraint

Stalin would not shoot down unarmed transports in agreed corridors and risk war, so the blockade could not be enforced against the air.

Outcome

Containment was shown to work without firing a shot; Stalin lifted the blockade on 12 May 1949.

Marking criteria

1 mark for the corridors/organisation; 1 mark for the scale of supply with figures; 1 mark for Soviet unwillingness to escalate; 1 mark for linking these to the lifting of the blockade.

A 5-mark "explain ... using the source" wants the source decoded, then linked to own knowledge.

Decode the source

Source A captures the Airlift as an industrial process: rapid turnaround, a single rigid approach pattern and a continuous stream of landings. This is the "block system" General William Tunner imposed, drawing on his China-Burma "Hump" experience.

Own knowledge

The November 1945 agreement guaranteed three 20-mile corridors into Tempelhof, Gatow and the new Tegel. C-54 Skymasters progressively replaced the smaller C-47s to lift heavier loads; the daily total climbed from a precarious start to 12,941 tonnes on the "Easter Parade" of 16 April 1949, far above the 4,500-tonne survival minimum.

The outcome

Reliable winter supply meant Stalin's blockade could not starve West Berlin out, and he lifted it on 12 May 1949.

Marking criteria

1 mark for reading the source as evidence of organised, high-frequency operations; 1-2 marks for own knowledge (corridors, aircraft, tonnage with dates); 1 mark for Tunner's system by name; 1 mark for linking sustained supply to the blockade's failure.

A 5-mark "assess the usefulness" question rewards origin and perspective plus own knowledge, ending in a judgement.

Perspective and origin

Source B reflects the post-revisionist, archive-based reading associated with Vladislav Zubok (A Failed Empire, 2007): Soviet behaviour as improvisation and miscalculation rather than a blueprint for expansion. Its use of Soviet records makes it valuable for recovering Stalin's intentions, not just Western perceptions.

Corroboration from own knowledge

It fits the record: the blockade followed reactively on Western currency reform (18 to 23 June 1948) rather than preceding it, the Soviets left the air corridors untouched, and Stalin abandoned the blockade once the Airlift proved durable - behaviour more consistent with a failed gamble than a fixed plan.

Limitation

By stressing improvisation it can understate the genuine coercive intent; whatever its origin, the blockade was a deliberate attempt to force the West out of Berlin, and the orthodox reading (Schlesinger, Feis) of Soviet aggression captures that.

Judgement

Highly useful for correcting the image of a pre-planned offensive and for explaining why the blockade was so easily reversed, but it should be read alongside orthodox accounts that keep the coercive aim in view.

Marking criteria

1 mark for identifying the post-revisionist/archival perspective; 1-2 marks for own knowledge corroborating improvisation (reactive timing, corridors left open, blockade dropped); 1 mark for a limitation; 1 mark for a judgement on usefulness.

A 6-mark "explain the significance" wants consequences argued and ranked, not a description of the treaty.

Institutionalised commitment

NATO ended the historic American refusal to enter a peacetime alliance. Article 5 - an attack on one "shall be considered" an attack on all - tied the United States permanently to European defence; the qualifier preserved national discretion but the political commitment was real.

Bloc consolidation

Built on the Brussels Pact (17 March 1948), NATO fused the Western states into a single military bloc. With the FRG (23 May 1949) and GDR (7 October 1949), Europe's division became institutional, not just ideological.

Militarisation and escalation

NATO converted containment from economic policy (the Marshall Plan) into a standing military guarantee. West German rearmament and accession (1955) then prompted the Warsaw Pact (14 May 1955), completing the bloc system.

Judgement

NATO's significance was that it made the American presence in Europe permanent and the division of the continent structural - the single most durable institution of the Cold War, as Mary Sarotte argues.

Marking criteria

1-2 marks for the American commitment and Article 5; 1-2 marks for bloc consolidation and the two German states; 1 mark for the militarisation/Warsaw Pact link; 1 mark for a judgement of significance.

This is an extended-response/essay. Markers reward a sustained, evidence-based argument that addresses "to what extent" directly and weaves in historiography - not a narrative.

Band-6 PLAN

• Thesis. The Berlin crisis was the decisive accelerant of militarisation: it converted an economic and ideological contest into an armed standoff, producing NATO and two German states. But it crystallised rather than created the process - the doctrine (1947) and bloc consolidation were already under way - so it was the turning point at which militarisation became irreversible, not its sole cause.
• Argument 1 - The crisis militarised the confrontation. For the first time the superpowers faced off over territory with armed force in play: Clay's proposed armed convoy, B-29s "atomic-capable" deployed to Britain, and a year-long aerial operation. The Airlift made containment a demonstrated military capability, not just a policy. Evidence: 277,000 flights, 2.3 million tonnes, the 16 April 1949 peak.
• Argument 2 - It produced the institutions of the armed Cold War. NATO (4 April 1949) institutionalised the American military commitment; the FRG (23 May) and GDR (7 October) made the division of Germany permanent; the Soviet bomb (29 August 1949) ended the American monopoly. By the end of 1949 Europe had a fixed military frontier.
• Argument 3 - It crystallised rather than originated the split. The drift to militarisation predated the blockade: the Truman Doctrine and Marshall Plan (1947), the Czech coup and Brussels Pact (early 1948). The crisis was the moment these hardened into armed blocs; NATO was signed before the blockade was even lifted, showing the alliance was a response to the wider confrontation, not just to Berlin.
• Historiography. Orthodox accounts (Schlesinger, Feis) read the blockade as Soviet aggression defeated by Western resolve, making the militarisation defensive. Post-revisionists using Soviet archives (Vladislav Zubok, A Failed Empire, 2007) treat it as a Stalin improvisation that backfired, suggesting the militarisation was an unintended consequence of a failed gamble. Daniel Harrington (Berlin on the Brink, 2012) stresses that the Airlift only became sustainable from October 1948, qualifying the narrative of inevitable Western triumph; Avi Shlaim (1983) credits Bevin with pushing the airlift when Washington leaned towards withdrawal.
• Judgement. Weigh Soviet intent (orthodox) against improvisation (Zubok): whatever Stalin's aim, the crisis was the decisive moment militarisation became structural and irreversible - the hinge of 1949 - even though the underlying division was already forming.

MODEL PARAGRAPH (Argument 2)

The clearest evidence that the Berlin crisis militarised the Cold War lies in the institutions it produced within a single year. The North Atlantic Treaty, signed in Washington on 4 April 1949 - while the blockade still held - bound twelve states by Article 5 to treat an attack on one as an attack on all, ending the historic American refusal to enter a peacetime alliance and making the United States the permanent guarantor of European defence. The proclamation of the Federal Republic on 23 May and the German Democratic Republic on 7 October turned the occupation zones into rival states, fixing the inner-German border as the Cold War's central military frontier. And the Soviet atomic test of 29 August ended the four-year American monopoly, ensuring that the confrontation NATO had just formalised would be conducted under the shadow of mutual nuclear capability. As Mary Sarotte argues, Article 5 became the durable institutional core of European security; the crisis of 1948 to 1949 was the moment that core was cast.

Marker's note. A band-6 response keeps "to what extent" in view throughout, ranking the crisis against the prior drift to militarisation rather than narrating the Airlift, anchors every claim in dated evidence (NATO 4 April, FRG 23 May, GDR 7 October, bomb 29 August), and sets at least two historians in genuine tension (orthodox Soviet aggression vs Zubok's improvisation). Telling the story of the Airlift without arguing its significance caps the response in the middle bands.

This is an extended-response/essay. Markers reward a sustained, evidence-based argument that defends a thesis and weaves in historiography - not a narrative.

Band-6 PLAN

• Thesis. The Airlift's success rested on both: Western strength (organisation, capacity and political will) made the operation possible, but it was only decisive because Stalin chose restraint over force. Western strength was the necessary condition; Soviet restraint was the permissive one. The two are not rivals so much as the two sides of why the blockade failed.
• Argument 1 - Western strength was real and decisive. The Airlift was an extraordinary logistical achievement: three guaranteed corridors, Tunner's block system, a switch to C-54s, 277,000 flights and 2.3 million tonnes, peaking at 12,941 tonnes on 16 April 1949 - well above the 4,500-tonne survival minimum. Political will mattered too: Truman authorised the Airlift over withdrawal, and Bevin pushed it when Washington hesitated (Shlaim).
• Argument 2 - But it depended on Soviet restraint. The corridors ran through Soviet-controlled airspace; Stalin could have closed them, jammed navigation or shot down transports. He did not, because attacking unarmed aircraft in agreed corridors would have been an act of war he was unwilling to risk while the United States held the atomic monopoly. The Airlift worked because it was never seriously contested in the air.
• Argument 3 - Why restraint, not strength, set the ceiling. Zubok's archival reading suggests the blockade was an improvisation Stalin abandoned once it failed; he had no plan to escalate. Harrington shows the operation only became sustainable from October 1948 - meaning that an earlier Soviet decision to contest it could have broken it before Western strength told. Restraint bought the time that strength then exploited.
• Historiography. Orthodox accounts (Schlesinger, Feis) foreground Western resolve and Soviet defeat; post-revisionists (Zubok) foreground Stalin's miscalculation and restraint; Harrington (2012) and Shlaim (1983) complicate both by stressing how close-run and contingent the operation was, and how much it owed to British advocacy.
• Judgement. Reject the either/or: Western strength executed the Airlift, but Soviet restraint permitted it. The decisive variable was that Stalin would not risk war - so restraint set the conditions under which Western strength could prevail.

MODEL PARAGRAPH (Argument 2)

However impressive the Western effort, the Airlift could function only because Stalin declined to stop it. Every flight ran through three corridors over Soviet-controlled territory; the Soviets could have jammed the radio beacons, flooded the corridors with "training" flights, or simply shot the transports down, any of which might have broken an operation that, as Daniel Harrington shows, was not even self-sustaining until October 1948. They did none of these things. The reason was strategic restraint: firing on unarmed aircraft flying in corridors the Soviets themselves had agreed to in November 1945 would have been an unambiguous act of war, and Stalin was unwilling to provoke one while the United States alone possessed the atomic bomb. Vladislav Zubok's archival account reinforces the point, presenting the blockade as a gamble Stalin improvised and then quietly abandoned rather than a confrontation he was prepared to fight to the end. Western strength filled the corridors; Soviet restraint left them open.

Marker's note. A band-6 response evaluates the proposition rather than describing the Airlift, holding "Western strength" and "Soviet restraint" in explicit tension and reaching a defended judgement (here, both are necessary, with restraint as the permissive condition). It anchors claims in dated evidence and deploys historians in genuine conflict (orthodox resolve vs Zubok's improvisation, with Harrington on contingency). Listing achievements without weighing the two factors caps the response in the middle bands.