Compare isolation aims with Britain’s undertaking
Compare the May planning account and March assurance to explain the risk that an attack intended to stay local could become a wider war.
Exam scope and assessment notes
Twelve introductory lessons, 36 explained tasks, twelve analytical models and four selected comparison workshops introduce revised International AS enquiry 9.4. The sequence introduces the March guarantee and April reciprocity, British warnings and entry, selected German expansionist aims, April planning, June coordination, the final August order, Halder’s Western estimate and Raeder’s later testimony. Four of seventeen editorial working entries have partial introductory links; these are planning aids, not an official denominator or completion percentage. This is partial coverage, not full AS or A Level preparation. These introductions do not complete those four entries or the wider enquiry. The August treaty and protocol, fuller French and Polish perspectives, the wider history of German aims and command differences, Danzig and the Corridor, British preparation, German alliances and a weighed overall explanation remain unfinished. The other thirteen editorial entries remain wholly unlinked in this sequence. C-120 is a selected partial English documentary translation; omitted annexes are not reconstructed. Halder’s translated notes are fragmentary and not official OKH war diaries. Retrospective testimony is identified separately. Earlier enquiry 9.3 lessons receive no automatic 9.4 credit. Historical depth, wider authentic reading, subject-specialist review, full source sets, timed papers and calibrated marking remain unfinished. Existing 2026 lessons receive no automatic revised-year coverage credit. International history, 1929–1939 belongs to International Paper 1 in 2029 and International Paper 2 in 2027 and 2028. Keep it separate from the 1919–1929 topic, imperialism rotation and 2026 material. Paper 1 Historical sources is 75 minutes and 40 marks: both parts of one question use four sources totalling at most 600 words, at least three written and up to one visual. Part (a) compares two sources for 15 marks; part (b) uses all four and contextual knowledge for a 25-mark judgement. Paper 2 Outline study is 105 minutes and 60 marks: answer two questions from one section, both parts of each, with a 10-mark causal explanation and a 20-mark argument. These lessons are not complete papers or calibrated assessment.
Before you begin
- Distinguish a planning assumption, a stated preference, a proposal and an implemented decision
- Identify the responsible actor and date; separate contemporary arguments, later accounts and verified outcomes
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
How should you explain changes in international relations?
What you will learn
- Did the May account assume that the Polish operation would simply repeat the Czech affair without war?
- Do the two texts prove that Britain had already declared war or that Hitler read this exact British statement?
- How could an isolation strategy fail and turn an invasion into a wider conflict?
Compare selected sources on commitments and the widening of war
- Write your own response before opening the model.
- Use dated evidence, identify actors and compare aims, obligations and practical outcomes. Attribute claims and distinguish contemporary texts from later editorial context.
Twelve introductory lessons, 36 explained tasks, twelve analytical models and four selected comparison workshops introduce revised International AS enquiry 9.4. The sequence introduces the March guarantee and April reciprocity, British warnings and entry, selected German expansionist aims, April planning, June coordination, the final August order, Halder’s Western estimate and Raeder’s later testimony. Four of seventeen editorial working entries have partial introductory links; these are planning aids, not an official denominator or completion percentage. This is partial coverage, not full AS or A Level preparation. These introductions do not complete those four entries or the wider enquiry. The August treaty and protocol, fuller French and Polish perspectives, the wider history of German aims and command differences, Danzig and the Corridor, British preparation, German alliances and a weighed overall explanation remain unfinished. The other thirteen editorial entries remain wholly unlinked in this sequence. C-120 is a selected partial English documentary translation; omitted annexes are not reconstructed. Halder’s translated notes are fragmentary and not official OKH war diaries. Retrospective testimony is identified separately. Earlier enquiry 9.3 lessons receive no automatic 9.4 credit. Historical depth, wider authentic reading, subject-specialist review, full source sets, timed papers and calibrated marking remain unfinished. Existing 2026 lessons receive no automatic revised-year coverage credit.
Two-source comparison workshop
The opening brief is original StudyForA teaching prose, not a quotation or contemporary source. A and B are separately labelled original paraphrases of selected identified passages, not complete authentic documents or a full four-source examination set. International history, 1929–1939 belongs to International Paper 1 in 2029 and International Paper 2 in 2027 and 2028. Keep it separate from the 1919–1929 topic, imperialism rotation and 2026 material. Paper 1 Historical sources is 75 minutes and 40 marks: both parts of one question use four sources totalling at most 600 words, at least three written and up to one visual. Part (a) compares two sources for 15 marks; part (b) uses all four and contextual knowledge for a 25-mark judgement. Paper 2 Outline study is 105 minutes and 60 marks: answer two questions from one section, both parts of each, with a 10-mark causal explanation and a 20-mark argument. These lessons are not complete papers or calibrated assessment.
StudyForA teaching brief · original prose · Compare isolation aims with Britain’s undertaking
[1] Original analytical teaching prose, not a quotation or contemporary source. Compare the May planning account and March assurance to explain the risk that an attack intended to stay local could become a wider war.
A · May German conference account · original paraphrase, not quotation
[1] The systematised record distinguished Poland from the earlier Czech affair, discussed attacking at a suitable opportunity and treated isolation as decisive. It also considered alternative responses if a Western conflict could not be avoided.
B · March British assurance · original paraphrase, not quotation
[1] Britain gave an interim undertaking of support if Polish independence was clearly threatened and Poland considered armed resistance vital. The statement did not itself announce war or guarantee support for every possible Polish action.
1. How could an isolation strategy fail and turn an invasion into a wider conflict?
Compare after trying
The comparison identifies a possible mechanism for widening the conflict. The May account treated Poland’s isolation as decisive, whereas Britain had declared a conditional undertaking to support Polish independence. An attack could therefore encounter a response which frustrated the aim of keeping the war local. The relevance lies in the interaction of decisions, not merely the fact that one text preceded the other.
Both texts need qualification. The British assurance was interim and conditional, not an immediate declaration of war or support for every Polish action. The May record recognised the risk of war and considered different responses if Western conflict could not be avoided. It did not guarantee another bloodless outcome or establish one fixed strategy which remained unchanged through August.
A complete causal argument must then follow implementation. Britain’s September warnings and announcement show how the undertaking was applied, while German orders establish the decision to use force. The pair alone does not prove that Hitler read this precise British text or measure every commander’s belief in the threat. It also does not make the guarantee the sole cause of the invasion. Its value is to show why an expansionist attack, an isolation calculation and an outside commitment could combine to produce a conflict wider than the attacker preferred.
Why this response fits
- Define the claim and connect dated aims, preparations, decisions and outcomes.
- Distinguish a record’s assertion, an operational instruction, a conditional estimate and a later recollection.
- This original self-review model is not an authentic examination script, Cambridge grade or calibrated mark.
Compare two different decisions
The March assurance concerns what Britain said it would do in response to a qualifying threat to Polish independence. The May conference record concerns German aims and calculations about attacking Poland and dealing with the Western powers. They address connected problems from different positions, dates and purposes. They are not two identical questions answered simultaneously. Comparing them can reveal a conflict between a declared commitment and an isolation strategy, without proving that either text caused the other or that one author had read this exact version of the other.
Read the risk inside the May account
The May record did not simply promise another bloodless success. It distinguished the Polish case from the earlier Czech affair, discussed war and identified isolation as decisive. It also discussed different strategic responses if a conflict with the Western powers could not be avoided. This establishes recognised risk and conditional planning, not a single unchanging sequence or a guarantee that the West would remain outside the war. A preference for a short or local war is different from certainty that it will occur.
Read Britain’s undertaking within its conditions
The March statement offered interim support if Polish independence was clearly threatened and Poland considered armed resistance vital. That undertaking could increase the expected cost of attacking Poland by linking it to another power’s involvement. It was not an unconditional guarantee of every Polish action or a declaration of war at the time. Comparing it with isolation aims identifies the point at which other states’ commitments could frustrate an intended local conflict; it does not measure whether the threat was believed or how every German commander assessed it.
Build a mechanism rather than a verdict from two dates
If Germany attacked under circumstances Britain treated as activating its undertaking, the attempt to isolate Poland might fail. That connects aggression, expectations and the response of another government. It does not make the British guarantee the sole cause of Germany’s invasion, or make the May record the final execution order. The September communications and decisions are needed to establish how the commitment was actually applied. Wider French, Polish and German evidence is still required for the full causal balance.
Sources for this lesson
- Cambridge History 9489 · 2027–2029 · enquiry 9.4 p. 36 · official Version 2 PDF retrieved; selected enquiry and rotation pages checked with the April 2025 update
- Cambridge History 9489 · 2027–2029 update · Version 2 changes, April 2025
- L-79, Schmundt’s systematised conference record, 23 May 1939 · selected printed pp. 847–850 in the English 1946 documentary edition; Harvard text. Not a verbatim recording, representative survey or independent validation of Nazi economic claims.
- UK Parliament, Hansard, 31 March 1939, vol. 345 cc. 2415–2420 · selected Chamberlain assurance and questions; conditional interim undertaking, not an unconditional frontier guarantee
- Cambridge History 9489, 2027–2029 Version 2 · International AS enquiry 9.4, printed p. 36; selected teaching links do not establish complete syllabus or assessment coverage
Pause and explain
Which explanation best fits this lesson?
Worked example
Did the May account assume that the Polish operation would simply repeat the Czech affair without war?
Show the worked solution
- Identify the distinction from the earlier affair.
- Identify the recognised possibility of war.
- Identify isolation as an objective rather than an achieved result.
Answer No. It explicitly distinguished the Polish case and treated isolation as important to the outcome. The record contains conditional calculations about Western conflict, not a guarantee of a bloodless repetition.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Guided: Did the May account assume that the Polish operation would simply repeat the Czech affair without war?
Give me a hint
Look for the qualification and the task of isolation.
Compare my reasoning
- Identify the distinction from the earlier affair.
- Identify the recognised possibility of war.
- Identify isolation as an objective rather than an achieved result.
No. It explicitly distinguished the Polish case and treated isolation as important to the outcome. The record contains conditional calculations about Western conflict, not a guarantee of a bloodless repetition.
Look for these in your work
- Uses the stated difference and recognised risk
- Keeps the isolation task separate from an achieved diplomatic outcome
Independent: Do the two texts prove that Britain had already declared war or that Hitler read this exact British statement?
Give me a hint
Separate what each text establishes from an inference about transmission.
Compare my reasoning
- Identify the conditional British assurance.
- Identify the German planning calculations.
- State what a reception or belief claim would require.
No. The March text was a conditional interim undertaking, and the May text records German calculations. Establishing receipt, interpretation or belief in a particular statement requires additional evidence; the comparison alone cannot supply it.
Look for these in your work
- Preserves the conditional status of the British undertaking
- Requires reception evidence before inferring a particular leader’s reading or belief
Transfer: How could an isolation strategy fail and turn an invasion into a wider conflict?
Give me a hint
Connect the attacker’s expectations with another government’s application of its commitment.
Compare my reasoning
- Explain the intention to keep the conflict local.
- Explain how a qualifying invasion might activate outside support.
- Require the later communications and actions to establish implementation.
A German attack could be met by British action under the undertaking, defeating the hope of a local war. The mechanism depends on decisions and implementation, not dates alone. It helps explain widening without making the guarantee the sole cause of the invasion or treating May as the final attack order.
Look for these in your work
- Connects aggression, isolation expectations and external assistance causally
- Retains later implementation and the distinction between invasion and widening
Common mistakes
- Compare positions and purposes rather than treating the two statements as identical questions answered together.
- Recognised Western-war risk is not identical to a desired or guaranteed wider war.
What can you explain now?
Which explanation best fits this lesson?
Compare with the explanation
Compare recognised risks, a conditional commitment and later implementation
Different commitments and expectations can interact, but their implementation must be established separately.
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Make it stick
Which explanation best fits this lesson?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.