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NotesHistoryTopic 16.2Practices of the Second World War (1939–45)
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16.2.33 min read

Practices of the Second World War (1939–45)

IB History • Unit 16

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Contents

  • How the war was fought on land, sea and air
  • The great campaigns: Eastern Front, Britain, Atlantic and Pacific
  • Total war, foreign powers and why the Allies won

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The big idea: The Second World War was won by fast machines and huge factories — the side that could move, fly, sail and out-produce the other side won.

In Paper 2, "practices" means how a war was actually fought. Examiners want the way fighting was done — not just who won.

The Second World War was faster and more machine-driven than any war before it. Tanks, planes, submarines and radios all worked together in new ways.

Germany opened the war with a new method called Blitzkrieg. Instead of digging trenches, it aimed to smash through and keep moving.

1

Break through

Dive-bombers and artillery hit one narrow point in the enemy line to punch a hole. Speed and shock did the work, not numbers.

2

Pour through the gap

Fast tank groups, called Panzers, raced through the hole before the enemy could react. This was a war of movement, not a war of trenches.

3

Surround and cut off

The tanks looped behind the enemy, trapping whole armies. France fell in just six weeks in 1940 using this method.

Blitzkrieg = break, race, surround — win before the enemy wakes up.

Air power was now central to everything. Planes scouted, bombed troops, sank ships and protected tanks below.

At sea, submarines and aircraft carriers changed the rules. A carrier let planes strike ships hundreds of miles away, long before the two fleets ever saw each other.

  • Land — tanks and infantry moving fast together, backed by air support and radio.
  • Air — bombing cities and troops, and protecting or attacking armies and fleets.
  • Sea — U-boats hunting convoys, and carriers launching air strikes.
Turn practices into an argument: Do not just describe weapons. Always ask how each practice helped decide the outcome — that is the skill Paper 2 rewards.

The war was decided in a few huge campaigns. Each one shows a different practice of war in action.

The Eastern Front — the biggest war of all

In June 1941 Hitler launched Operation Barbarossa. It was the largest land invasion in history, aiming to destroy the USSR quickly.

At first the German advance was stunning. But the Soviet Union was huge, and winter and distance wore the invaders down.

The turning point came at Stalingrad in 1942–43. A whole German army was surrounded in the city and forced to surrender.

Why Stalingrad mattered: Stalingrad broke the myth that Germany could not be beaten. After it, the German army was in retreat on the Eastern Front for the rest of the war.

Fighting also raged in North Africa and then Italy. The Allies pushed the Germans out of Africa by 1943, then invaded Italy — a second land front that drained German strength.

The Battle of Britain — air power alone

In 1940 Germany tried to bomb Britain into surrender. The RAF fought back in the skies and held on.

Britain's radar and fighter planes gave it the edge. It was the first battle in history decided almost entirely in the air.

The Battle of the Atlantic and the Pacific

Battle of the Atlantic (sea supply)

  • German U-boats sank ships bringing food and weapons to Britain.
  • Allies replied with convoys, radar and code-breaking to find the subs.
  • Winning it kept Britain fed and supplied for the rest of the war.

The Pacific (carrier warfare)

  • Fought between the US and Japan across huge ocean distances.
  • At Midway in 1942, US carriers sank four Japanese carriers.
  • Midway stopped Japan's advance and became the turning point in the Pacific.
Two turning points to name: Stalingrad (1942–43) turned the war in Europe; Midway (1942) turned the war in the Pacific. Both show how one battle can decide a whole campaign.

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The Second World War was a total war. That means whole countries — not just soldiers — were pulled into the fight.

Governments took control of factories to make tanks, planes and shells. Ordinary life bent completely around the war effort.

  • War production — factories switched from cars and radios to tanks and bombers.
  • Rationing — food and fuel were shared out by the state so armies came first.
  • Civilian involvement — women took factory jobs, and everyone faced bombing at home.
The war of the factories: The side that could build more weapons, faster, would win. Production power mattered as much as any battle.

Two giant powers joining the Allies decided this contest. Their entry tipped the balance of resources hugely.

The USA enters (December 1941)

After Japan attacked Pearl Harbor in December 1941, the USA joined the war. Its enormous factories then out-produced every enemy combined.

Lend-Lease

Even before joining, the USA sent trucks, food and weapons to Britain and the USSR under a scheme called Lend-Lease. This kept the Allies fighting.

Soviet scale

The USSR provided vast manpower and resources. It moved its factories east, out of German reach, and rebuilt its army to huge size.

By 1944 the Allies were closing in from every direction. Germany now faced a war on two fronts it could not win.

1

Two fronts squeeze Germany

The USSR pushed from the east while Britain and the USA prepared to strike from the west. Germany's army was split and stretched thin.

2

D-Day, June 1944

Allied troops landed in Normandy, France, in the largest sea invasion ever. This opened the western front and began the march toward Germany.

3

Germany surrenders, 1945

Caught between two advancing armies, Germany collapsed and surrendered in May 1945. The war in Europe was over.

4

Hiroshima and Nagasaki, August 1945

To end the Pacific war, the USA dropped atomic bombs on two Japanese cities. Japan surrendered days later, ending the war.

Two fronts → D-Day → Germany falls → atomic bombs → Japan falls.

The core reason for Allied victory: The Allies had far more people, factories and raw materials, and forced Germany to fight on two fronts at once. Superior production plus the two-front war beat German tactics.

IB Exam Questions on Practices of the Second World War (1939–45)

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How Practices of the Second World War (1939–45) Appears in IB Exams

Examiners use specific command terms when asking about this topic. Here's what to expect:

Define

Give the precise meaning of key terms related to Practices of the Second World War (1939–45).

AO1
Describe

Give a detailed account of processes or features in Practices of the Second World War (1939–45).

AO2
Explain

Give reasons WHY — cause and effect within Practices of the Second World War (1939–45).

AO3
Evaluate

Weigh strengths AND limitations of approaches in Practices of the Second World War (1939–45).

AO3
Discuss

Present arguments FOR and AGAINST with a balanced conclusion.

AO3

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Related History Topics

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16.1.1Types and causes of war: the framework
16.1.2Causes of the First World War (1914–18)
16.1.3Causes of the Second World War (1939–45)
16.2.1How wars are fought: the framework
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