Key facts and dates

In the spring of 1939, Britain and France dramatically shifted their foreign policy from appeasement to containment following Germany's occupation of Prague. This period, marked by a series of guarantees to Eastern European and Mediterranean nations, represented a diplomatic revolution aimed at curbing German expansion, though it faced significant challenges and ultimately failed to prevent war.

Timeline of key events

• 15 March 1939 – Germany occupies Prague, violating the Munich Agreement.
• 31 March 1939 – Britain and France guarantee Poland's independence.
• 13 April 1939 – Guarantees extended to Romania and Greece.
• 12 May 1939 – Turkey receives a guarantee from Britain and France.
• April-August 1939 – Anglo-French negotiations with the Soviet Union for a potential alliance.
• 23 August 1939 – Nazi-Soviet Pact signed, undermining hopes for a Grand Alliance.

The system of guarantees in 1939

Following Germany's occupation of Prague in March 1939, Britain and France abandoned their previous policy of appeasement, which had aimed to avoid conflict by conceding to Hitler's demands. Instead, they introduced a new system of guarantees to protect several nations from German aggression, marking a significant shift in European diplomacy.

Nations protected under the guarantees

• Poland (31 March 1939) - The first recipient of a guarantee, reflecting its strategic importance as a potential target of German expansion in Eastern Europe.
• Romania and Greece (13 April 1939) - These guarantees aimed to secure the Balkans and eastern Mediterranean against Axis influence.
• Turkey (12 May 1939) - A guarantee to Turkey sought to strengthen Allied positions in the Mediterranean and protect key trade routes.

This system represented a diplomatic revolution, moving from passive accommodation of Germany to active containment, with the intention of creating a united front against further aggression.

Motivations behind the shift to containment

The decision to issue these guarantees was driven by multiple strategic and political objectives. Britain and France sought to address the growing threat posed by Nazi Germany after the failure of appeasement became evident with the occupation of Prague.

Key reasons for the guarantees

• Containing German expansion - The primary aim was to halt Germany's territorial ambitions, particularly in Eastern Europe, where Hitler's intentions were increasingly clear.
• Demonstrating resolve - By publicly committing to defend these nations, Britain and France aimed to show they would no longer tolerate unchecked aggression.
• Building an anti-German coalition - The guarantees were intended to unite smaller nations under British and French leadership, forming a barrier against Axis powers.
• Deterring Hitler - There was a hope that visible commitments would make Hitler think twice before initiating further military action, potentially preventing war.

Limitations and challenges of the guarantees

Despite the bold intentions behind the guarantees, their practical effectiveness was severely limited. Several structural and strategic issues undermined their ability to serve as a credible deterrent to German aggression.

Key weaknesses in the guarantee system

• Difficulty in providing military assistance - Britain and France lacked the logistical means to offer direct support, especially to Poland, which was geographically distant and separated by Germany. Without Soviet cooperation, military aid was nearly impossible.
• Questions over military capability - Both Britain and France were not fully prepared for war in 1939, with rearmament still underway and doubts about their ability to wage a sustained conflict against Germany.
• Hitler's scepticism - Hitler doubted the resolve of Britain and France to follow through on their commitments, believing they lacked the will to fight, especially after years of appeasement. This perception reduced the deterrent effect of the guarantees.

Anglo-French negotiations with the Soviet Union

Recognising the importance of a broader alliance to counter Germany, Britain and France initiated talks with the Soviet Union from April to August 1939. These negotiations aimed to create a Grand Alliance but were fraught with difficulties and mutual distrust.

Key aspects of the negotiations

• Soviet demands - The Soviet Union, under Stalin, sought security guarantees for the Baltic states and a sphere of influence in Eastern Europe as a buffer against Germany. They also requested the right to send troops through Poland and Romania in the event of war.
• Western resistance - Britain and France were wary of granting the Soviets dominance in Eastern Europe, fearing it would replace one form of oppression with another. Ideological differences, with the Western democracies opposed to communism, further complicated matters.
• Disagreements over troop transit - Poland and Romania, suspicious of Soviet intentions, refused to allow Soviet troops to cross their territories, viewing such a presence as a threat to their sovereignty. This deadlock hindered military planning.
• Mutual suspicions - Both sides distrusted each other's motives. The West questioned whether the Soviets genuinely sought peace or aimed to exploit the situation, while Stalin doubted the Allies' commitment to a true partnership.

Reasons for the failure of a potential Grand Alliance

The negotiations ultimately collapsed, paving the way for the Nazi-Soviet Pact in August 1939, which shocked the world and made war almost inevitable. Several factors contributed to this failure, reflecting deep-seated divisions and strategic miscalculations.

Factors leading to the breakdown of talks

• Ideological antipathy - The fundamental opposition between Western democracies and Soviet communism created an atmosphere of hostility, making cooperation difficult.
• Distrust of Soviet intentions - Britain and France suspected Stalin might use an alliance to expand Soviet influence rather than genuinely oppose Germany, while Stalin believed the West wanted to push him into conflict with Hitler without offering real support.
• Refusal of smaller nations - Poland and Romania's rejection of Soviet troop transit rights was a major obstacle, as it prevented practical military coordination.
• Slow pace of negotiations - The talks dragged on without urgency, suggesting to Stalin that Britain and France were not fully committed to an alliance, prompting him to seek alternative arrangements.
• Soviet shift to Germany - Frustrated by the lack of progress, Stalin opted to negotiate with Hitler, resulting in the Nazi-Soviet Pact on 23 August 1939. This agreement secured a temporary non-aggression deal and divided Eastern Europe into spheres of influence, directly undermining the Allied position.

Could a Grand Alliance have prevented war?

The failure of the Grand Alliance raises the question of whether such a coalition could have deterred Hitler. A united front of Britain, France, and the Soviet Union might have presented a formidable obstacle to German aggression, potentially delaying or preventing the invasion of Poland. However, Stalin's calculations, driven by a desire to avoid immediate conflict and gain territorial concessions, made the Nazi-Soviet Pact a more appealing short-term option. This suggests that deep mistrust and conflicting priorities among the potential allies may have rendered a Grand Alliance unfeasible, even if negotiations had been pursued more urgently.