Edexcel IGCSE History: The Changing Nature of Warfare and International Conflict, 1919–2011 — Revision Notes

Quick-recall notes for Breadth Study B6 of Pearson Edexcel International GCSE History 4HI1 Paper 2, “The changing nature of warfare and international conflict, 1919–2011”. Full explanations are in the B6 study guide; practise with the B6 practice questions.

Syllabus coverage (4HI1, Breadth Study B6)

Key topic	Core content
1. 1919–39	Gas, tanks, artillery, submarines, aircraft in East Asia and Abyssinia, Spanish Civil War guerrillas
2. 1939–45	Blitzkrieg, Battle of Britain, Blitz, V weapons, Allied bombing, U-boats, D-Day, Arnhem, resistance, carriers
3. 1945–75	Atomic bombs, arms race, WMD, MAD, proliferation, arms talks, Arab–Israeli wars, Vietnam
4. 1976–2000	Gulf War, Falklands, carriers, nuclear submarines, Afghanistan, Star Wars, end of arms race
5. 2000–2011	Terrorism and 9/11, surgical strikes, drones in Pakistan, unmanned vehicles

Timeline

Date	Event
1925	Geneva Protocol bans gas warfare
1935–36	Italy uses aircraft and gas in Abyssinia
1937	Guernica bombed; Japan bombs Chinese cities
1939–40	Blitzkrieg in Poland and France
1940	Battle of Britain; Blitz begins
1941	Pearl Harbor
1942	Midway
1943	U-boats defeated in the Atlantic; Hamburg bombed
June 1944	D-Day; V-1s launched
Sept 1944	Arnhem; first V-2s
Aug 1945	Hiroshima and Nagasaki
1949	Soviet atomic bomb
1957	Sputnik shows Soviet missile capability
1963	Partial Test Ban Treaty
1965–73	US ground war in Vietnam
1967 / 1973	Six-Day War / Yom Kippur War
1968	Non-proliferation Treaty
1972	SALT I
1979–89	Soviet war in Afghanistan
1982	Falklands War
1983	Strategic Defense Initiative announced
1987	INF Treaty
1991	First Gulf War; end of the Cold War
2001	9/11; invasion of Afghanistan
2003	Invasion of Iraq
2004 onwards	US drone strikes in Pakistan

Themes traced

Theme	1919–45	1945–89	1990–2011
Land	Tanks and Blitzkrieg	Conventional Arab–Israeli wars; guerrilla Vietnam	100-hour Gulf ground war; counter-insurgency
Sea	U-boats; carriers replace battleships	Nuclear submarines; Falklands	Cruise missiles from ships
Air	Bombers, Battle of Britain, strategic bombing	Nuclear delivery; air strikes in 1967	Precision strikes; drones
Technology	Radar, radio, V weapons	ICBMs, MIRVs, SDI	Satellites, GPS guidance, robots
Guerrilla	Spain; French Resistance	Vietnam; Afghanistan	Iraq and Afghanistan insurgencies; terrorism

Key terms

Term	Meaning
Blitzkrieg	Fast attack combining tanks, aircraft and radio
Strategic bombing	Bombing industry and cities to break the enemy’s ability to fight
Amphibious	Landing troops from the sea
MAD	Mutually Assured Destruction
Proliferation	Spread of nuclear weapons to more states
Asymmetric warfare	Conflict between unequal forces, often guerrillas v a superpower
Surgical strike	Precise attack on a specific target
Drone / UAV	Unmanned aerial vehicle

Worked example: explain two ways different

Explain two ways in which air warfare in 1940 was different from air warfare in 1991. (6 marks)

1. Accuracy: in 1940 bombing was inaccurate, so cities were hit widely in the Blitz; in 1991 laser- and satellite-guided weapons hit specific buildings.
2. Technology: in 1940 piston-engined fighters fought within sight of each other, guided by early radar; in 1991 stealth aircraft and cruise missiles struck from long range, often unseen.

Essay plan in outline

“Air power was the most important change in warfare in the years 1919–2011.” How far do you agree?

• For: Blitzkrieg relied on dive-bombers; the Battle of Britain; carriers at Midway; atomic bombs; 1967 air strikes; Gulf War air campaign; drones.
• Against: nuclear weapons as a separate revolution; continuing importance of ground forces (D-Day, 1973, 1991 ground war); guerrilla wars where air power failed (Vietnam, Afghanistan).
• Judgement: air power changed most, but it rarely won wars without troops on the ground.

Turning points to argue about

• 1939–40: Blitzkrieg restores movement to land warfare.
• 1942: Midway shows the carrier is now the decisive warship.
• 1945: atomic bombs create a weapon that could end civilisation.
• 1991: the Gulf War shows the power of precision-guided weapons.
• 2001: 9/11 makes terrorism and counter-insurgency central to Western strategy.

Common mistakes and exam traps

• Assuming technology always wins. Guerrillas defeated superpowers in Vietnam and Afghanistan.
• Confusing V-1 and V-2. V-1 = flying bomb; V-2 = ballistic rocket.
• Treating MAD as a weapon. It is a theory of deterrence.
• Leaving out sea warfare. It is a named theme.

Frequently asked questions

Why did Blitzkrieg work in 1939–40? Speed, concentration of tanks, air support and radio communication against slower, defensive opponents.

Why were carriers decisive in the Pacific? Aircraft could strike far beyond the range of battleship guns.

What made drones important? Strikes without risk to the operator’s life, at long range.

Source

Pearson Edexcel International GCSE History (4HI1) specification, Issue 5, February 2026, Paper 2, Breadth Study B6.