O Level World History: Depth Study E, The Second World War 1939-c.1945 (Cambridge 2147)

Depth Study E covers the Second World War in two theatres – Europe and the Asia-Pacific – from 1939 to about 1945. Cambridge O Level History (2147) asks how the war developed in each region, what it did to civilians under bombing and occupation, and how the Allies won and secured their victory. The syllabus names specific case studies (Malaya and Singapore, Poland, and resistance in Malaya and France), so learn them in detail.

Where this fits in 2147

Depth Study E was introduced in the 2024-2026 syllabus. It is examined in Paper 1, Section B (two questions on each Depth Study; you answer one, worth 4 + 6 + 10 marks). It follows on from Core Content key question 2.3 on Hitler’s foreign policy. Related pages: Depth Study E revision notes, Depth Study E practice questions and Depth Study B, Germany 1918-45.

Syllabus coverage

CAMBRIDGE O LEVEL HISTORY (2147), 2024-2026 – DEPTH STUDY E: THE SECOND WORLD WAR IN EUROPE AND THE ASIA-PACIFIC, 1939-c.1945

• 1 How did the war in Europe develop? German control of Europe in 1940 (France’s surrender and Vichy, Dunkirk, Operation Sea Lion, the Battle of Britain); why Germany could not conquer Britain; Operation Barbarossa; Stalingrad as a turning point.
• 2 How did the war in the Asia-Pacific develop? Deteriorating US-Japanese relations; Pearl Harbor; early Japanese success (case study: Malaya and Singapore); Midway.
• 3 What was the impact of war on civilians? The Blitz and the bombing of Germany; Japanese control (case study: Malaya and Singapore); Nazi control (case study: Poland, including the Holocaust); resistance in Malaya and France.
• 4 How did the Allies achieve victory? Sicily and Italy; D-Day and the Russian advance; Guadalcanal, Okinawa, island-hopping, bombing and the atomic bomb; occupation of Germany and Japan; the Nuremberg and Tokyo trials.

Key question 1: the war in Europe, 1939-43

Blitzkrieg. Germany’s “lightning war” combined tanks, motorised infantry and dive-bombers to break through and encircle. Poland fell in weeks in September 1939; Denmark and Norway followed in April 1940; in May 1940 German armour passed through the Ardennes, cutting off Allied armies in Belgium.

Dunkirk and the fall of France. Over 300,000 British and French soldiers were rescued from Dunkirk between late May and early June 1940 by naval and civilian ships – an escape that preserved Britain’s army but abandoned its heavy weapons. France signed an armistice in June 1940; Germany occupied the north and Atlantic coast, and Marshal Pétain’s government at Vichy collaborated in the south.

Why not Britain? Hitler’s invasion plan, Operation Sea Lion, needed air superiority. In the Battle of Britain (summer-autumn 1940) the RAF’s radar chain, efficient fighter control and Hurricane and Spitfire squadrons defeated the Luftwaffe’s attempt to destroy them. Germany’s switch to bombing cities from September 1940 gave the RAF relief, and Sea Lion was postponed indefinitely. Britain’s navy, the Channel and the support of the Empire and, increasingly, the USA also mattered.

Barbarossa. Hitler invaded the USSR on 22 June 1941 to gain Lebensraum, destroy communism and seize resources such as Ukrainian grain and Caucasus oil, believing the purged Red Army would collapse. Initial victories were enormous, but the advance stalled before Moscow in winter 1941.

Stalingrad. In 1942 German forces pushed towards Stalingrad and the Caucasus. The Red Army held the city, then encircled the German Sixth Army under Paulus, which surrendered in February 1943. It was a turning point because Germany lost a whole army and the strategic initiative in the east.

Key question 2: the war in the Asia-Pacific

Relations deteriorate. Japan’s expansion into Manchuria (1931) and China (1937), its alliance with Germany and Italy (1940) and its occupation of French Indochina led the USA to freeze Japanese assets and stop oil sales in 1941. Japan, dependent on imported oil, decided to seize the resources of Southeast Asia and strike the US fleet first.

Pearl Harbor (7 December 1941). Japanese carrier aircraft sank or damaged eight battleships at the US base in Hawaii. Tactically successful, it missed the American aircraft carriers and fuel stores – and brought the USA fully into the war.

Malaya and Singapore. Japanese forces landed in northern Malaya on 8 December 1941. They advanced quickly using jungle tactics and bicycles, outflanking British defensive positions; Japanese aircraft sank the Prince of Wales and Repulse on 10 December; British commanders underestimated Japan and lacked tanks and modern aircraft. Singapore surrendered on 15 February 1942 under General Percival – one of Britain’s worst defeats.

Midway (June 1942). US codebreakers revealed Japan’s plan, allowing Admiral Nimitz to prepare an ambush. American dive-bombers sank four Japanese carriers. After Midway Japan could no longer expand, and US industrial strength began to tell.

Key question 3: civilians at war

• The Blitz (1940-41): London was bombed for 57 consecutive nights from September 1940; cities such as Coventry were devastated. Civilians sheltered in the Underground and Anderson shelters; children were evacuated. Morale was strained but held.
• Bombing of Germany (1943-45): Bomber Command’s area bombing and US daylight raids caused firestorms in Hamburg (1943) and Dresden (1945) and huge civilian casualties; historians still debate whether it shortened the war.
• Japanese rule in Malaya and Singapore: the Sook Ching massacres of Chinese civilians, the Kempeitai’s brutality, shortages of rice and medicine, worthless occupation currency, and forced labour; Malays and Indians were treated differently from Chinese as Japan tried to divide the population.
• Nazi rule in Poland: Poland was divided with the USSR in 1939; western areas were annexed and the rest ruled as the General Government. Polish leaders and teachers were killed, Jews forced into ghettos such as Warsaw, then from 1941-42 murdered in mass shootings and death camps such as Auschwitz-Birkenau and Treblinka. About six million Jews died in the Holocaust.
• Resistance: in France, sabotage, intelligence and escape networks, and Maquis fighters with British SOE support, especially around D-Day; in Malaya, the Malayan People’s Anti-Japanese Army fought a jungle guerrilla war. Resistance was costly, provoked reprisals, and could not liberate territory alone.

Key question 4: Allied victory

Italy. The Allies invaded Sicily (July 1943); Mussolini was removed and Italy surrendered in September, but German forces defended Italy until 1945. The campaign diverted German divisions.

Germany’s collapse. D-Day (6 June 1944) opened a second front in France; the Allies liberated Paris in August and crossed the Rhine in March 1945. From the east the Red Army advanced through Poland to Berlin. Bombing had wrecked German oil and transport. By April 1945 Berlin was surrounded; Hitler killed himself on 30 April and Germany surrendered in May.

Japan’s defeat. The six-month battle for Guadalcanal (1942-43) began the US counter-offensive. Island-hopping took key islands while bypassing others; Okinawa (1945) showed how costly an invasion of Japan would be. B-29 fire-raids devastated Japanese cities. Truman authorised the atomic bombs on Hiroshima and Nagasaki (August 1945); with the Soviet declaration of war, they led Japan to surrender. Arguments for the decision: saving US and Japanese lives compared with invasion; ending the war quickly. Against: huge civilian death toll; Japan may already have been near surrender; a warning to the USSR.

Consolidating victory. Germany and Berlin were divided into four zones; Japan was occupied by the USA under MacArthur, demilitarised and democratised. War crimes trials at Nuremberg and Tokyo established that leaders could be punished for aggression and atrocities.

Worked example: a (b) answer

Explain why the Japanese were successful in Malaya and Singapore. [6]

1. Speed and tactics: Japanese troops were experienced, travelled light and outflanked British positions through the jungle, so the defenders kept retreating.
2. Air and sea power: control of the air and the sinking of the Prince of Wales and Repulse left the British without naval protection.
3. British weaknesses: commanders underestimated Japan, had few tanks and modern aircraft, and Singapore’s defences had been planned mainly against attack from the sea.

Common mistakes

• Treating the Asia-Pacific war as an afterthought.
• Saying Pearl Harbor destroyed the US Navy.
• Describing the Holocaust without connecting it to the case study of Poland.
• Forgetting the Italian campaign in key question 4.

Frequently asked questions

Why is Malaya and Singapore in two key questions? It is the case study both for early Japanese success (key question 2) and for life under Japanese control (key question 3).

Do I need naval detail for Midway? Know the codebreaking, the four carriers lost and why it was a turning point.

What counts as “consolidation of victory”? The Allied occupations of Germany and Japan and the war crimes trials at Nuremberg and Tokyo.

Official syllabus

Cambridge O Level History (2147) syllabus for examination in 2024, 2025 and 2026 – cambridgeinternational.org (Depth study E, focus points and specified content). Always check the current syllabus before an exam.