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The big idea: "Practices of war" is the IB's way of asking a simple question: how was a war actually fought, and did the way it was fought decide who won?
This micro gives you a toolkit — a set of headings you can apply to any war on the syllabus to build a smart, comparative answer.
Paper 2 does not want a battle-by-battle story. It wants you to explain why one side prevailed and to weigh the causes against each other.
To do that well, you need reusable categories. Four of them do most of the work: technology, the fighting domains (air, sea, land), total war and the home front, and the role of foreign powers.
- Technology — the weapons and inventions that changed what armies could do, from machine guns and tanks to radar, aircraft and the atomic bomb.
- Domains — air, naval and land warfare; a war can be won or lost in any one of them, or by how well they are combined.
- Total war — when a whole society, not just its army, is mobilised: factories, food, propaganda and civilians all become part of the war effort.
- Foreign powers — the allies, interventions and outside supplies of money and material that tip the balance between the two sides.
Spot it: the four headings (T-D-T-F): Technology · Domains · Total war · Foreign powers. If you can say something intelligent under each of these four for a given war, you have the skeleton of a top essay.
One more idea holds the toolkit together: strategy. Strategy is the overall plan for using resources and technology to reach victory.
The best answers show that outcomes came not from any single factor but from how strategy, resources and technology fit together — a weaker army with a smarter plan and richer allies can beat a stronger one.
Why this micro is the key that unlocks the topic: Every "practices of war" and "effects of war" essay draws on these categories. Learn the framework once here, then apply it to your chosen wars (e.g. WWII, the Chinese Civil War, the Spanish Civil War). You are learning how to think, not just what happened.
Across the 20th century, technology repeatedly changed the nature of war (how it felt to fight) and its scale (how many people and how much destruction). Machine guns and artillery made attacking deadly and produced the trench deadlock of WWI.
Then tanks, aircraft, radio and motor transport made war mobile again — the basis of Germany's fast-moving blitzkrieg in 1939–41.
Technology changes nature AND scale: Nature: new weapons change how wars are fought — from static trenches to mobile armoured pushes.
Scale: new weapons make wars bigger and deadlier — aircraft and the atomic bomb let armies destroy whole cities and populations, not just enemy soldiers.
But technology rarely wins on its own. A weapon matters only if a side has the resources to build it in quantity and the strategy to use it well.
Germany had excellent tanks in 1939 yet lost by 1945, because the Allies out-produced it and learned to counter blitzkrieg. Keep that lesson ready — it is the heart of a good judgement.
Land warfare
The decisive domain in most 20th-century wars — territory is taken and held by armies. Tanks, artillery and infantry combined (combined-arms) broke the trench stalemate and enabled fast advances.
Naval warfare
Wins wars slowly by controlling supply. Blockade and submarine (U-boat) campaigns tried to starve the enemy; carriers made the sea a base for air power, as in the Pacific War.
Air warfare
New in the 20th century. It supported armies (dive-bombers in blitzkrieg), attacked the enemy's economy and morale (strategic bombing of cities), and delivered the atomic bomb in 1945.
Land takes ground, sea controls supply, air strikes deep — and the winner usually combines all three.
The domains working together: the Pacific War (1941–45): Japan and the USA fought across a vast ocean, so naval power (aircraft carriers) carried air power to strike enemy fleets and islands, which land forces then invaded.
No single domain decided it. American victory came from combining all three — backed by an economy that could replace lost ships and planes far faster than Japan could.
Technology helps you win when…
- You can mass-produce it (resources back it up)
- You have a strategy that uses its strengths
- You combine domains instead of relying on one
- You can supply and repair it in the field
Technology fails to decide when…
- The enemy out-produces you (Germany vs the Allies)
- It is used piecemeal without a clear plan
- The enemy adapts and counters it
- Your economy cannot sustain the effort
| Innovation | Domain | How it changed war |
|---|---|---|
| Machine gun & heavy artillery | Land | Made attacking deadly — caused WWI trench deadlock |
| Tank + radio + aircraft (blitzkrieg) | Land/Air | Restored mobility; fast, deep advances in 1939–41 |
| Submarine (U-boat) & blockade | Naval | Tried to strangle enemy supply and starve the home front |
| Aircraft carrier | Naval/Air | Made the ocean a base for air power (Pacific War) |
| Strategic bomber | Air | Attacked the enemy economy and civilian morale directly |
| Atomic bomb (1945) | Air | Unprecedented scale — destroyed whole cities; ended the Pacific War |
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Total war: the whole society fights: In a total war, the difference between soldier and civilian breaks down.
Factories, farms, scientists, women, propaganda and government control of the economy all become weapons. Wars are increasingly won by the side that can out-mobilise the other, not just out-fight it on the battlefield.
The home front is where this mobilisation happens. Governments direct industry to make weapons, ration food, recruit millions of women into factories, and use propaganda to keep people willing to sacrifice.
Because the home front now feeds the war, it also becomes a target — which is why strategic bombing and blockade aimed at civilians and factories, not only armies.
Economic mobilisation
Government takes control of industry and shifts it to war production — tanks, planes, shells. The side with the bigger, better-organised economy can replace losses and simply wear the enemy down.
Human mobilisation
Millions are conscripted into the armed forces, while women and older workers fill the factories and farms left behind. Total war reaches into every household.
Morale and propaganda
Since civilians must endure shortages and bombing, governments manage morale with propaganda and censorship. A collapse in will at home can lose a war the army has not yet lost.
Total war = money + people + morale. Break any one and the war effort cracks.
Foreign powers can decide the outcome: Few 20th-century wars were purely two-sided. Outside states shaped outcomes through alliances, direct intervention, and supplies of money and material.
US Lend-Lease poured weapons, food and trucks into Britain and the USSR; foreign volunteers and Soviet, German and Italian aid shaped the Spanish Civil War (1936–39). Outside support can turn a losing side into a winning one.
Alliances
Fighting alongside other states multiplies your resources and forces the enemy to split effort across several fronts — a major reason the Allies out-weighed the Axis in WWII.
Intervention
A foreign power sending its own troops or air units into another state's war — for example German and Italian forces fighting for Franco in Spain.
Material & financial support
Supplying weapons, oil, food, trucks and loans without necessarily sending troops — e.g. US Lend-Lease sustaining Britain and the USSR from 1941.
Why it matters for a judgement
Foreign support often explains outcomes better than battlefield skill: the richer coalition can absorb defeats the poorer side cannot.
Don't isolate the factors: Total war, technology and foreign help are connected. Foreign supplies feed the home front; the home front builds the technology; strategy decides how it is all used.
Weak answers list these separately. Strong answers show how they combine to produce victory or defeat.