If killing is wrong, how can going to war be justified? Is it always wrong to kill civilians? If a Nazi soldier were billeted in your home, should you respond when he greets you? Philosopher Cécile Fabre chooses Five Books that help explore the profound ethical dilemmas of war.

In military terms, the traditional view is that the rest of the world is struggling to catch up with the West, says Professor Jeremy Black. But, as some of his book choices reveal, this is historically inaccurate

Fear is a great examiner of one’s character, argues the World War II veteran and eminent historian of war, Sir Michael Howard. He recommends the best books on war, two on strategy and three on what it’s actually like for soldiers and commanding officers.

While many of us in the West commemorate the contribution of war veterans and the soldiers who lost their lives on our behalf, there’s also a tendency to see war as something distant and unconnected with our daily lives. Here Phil Klay, veteran of the US Marine Corps and award-winning novelist, recommends books that help bridge that gap—and capture the complicated relationship between soldiers and the societies on whose behalf they fight.

The Director of the Centre for the Study of Global Governance at the London School of Economics says there is fine line between being a hero and being a murderer – that’s why the Geneva convention matters

American military and economic superiority cannot explain why the Cold War came to an end in the late 1980s and early 1990s. According to the historian Archie Brown, you need to accept the primacy of politics and human agency both in the USSR and the West. He chooses five books to understand the Cold War and offers some broader reflections on the qualities of good political leadership—then and now.

The former BBC war reporter picks out essential reading on the Bosnia and Vietnam wars and explains why a book of poetry speaks more to him about the reality of conflict than any other writing

The foreign affairs commentator explains why US presidents have less room to manoeuvre on foreign policy than they think, and why President Obama had to set aside his “minimalist” inclinations.

Why were so few of the Nazis involved in running Auschwitz brought to justice? Why did some Germans during the Holocaust risk death to hide Jewish people from Nazi persecution, while others were passive bystanders? Historian Mary Fulbrook—author of Reckonings, which won the 2019 Wolfson History Prize—recommends essential reading for understanding Auschwitz and its aftermath.

Under what conditions do popular uprisings end in massacres? What’s the best way for someone protesting against a government to get what they want? Robert Poole, Professor of History at the University of Central Lancashire and author of Peterloo: The English Uprising, recommends the best books on uprisings.

When a period of war or oppression draws to a close, how should a country face up to past wrongdoing while creating a future free of conflict? Colleen Murphy—professor of law, philosophy and political science at the University of Illinois—discusses five books that examine the issues at the heart of ‘transitional justice.’

Should America have intervened in Libya? Done more? Done less? Done it differently? The editor of Foreign Affairs, Gideon Rose, explains the tension that lies at the heart of every American foreign policy decision.

Traditionally, the study of international relations has been about institutions, not individuals and the psychology that motivates them. But that is changing. Rose McDermott, professor of international relations at Brown University, introduces the work of Robert Jarvis and others pioneering the field of ‘political psychology.’

The 19th century opium war marked the clash of the world’s great empires of the age – Britain and China. Historian Julia Lovell says its legacy of Chinese humiliation is still felt keenly in Beijing.

History is usually studied and written from the perspective of war, says veteran journalist John Gittings. It can look very different when viewed from the perspective of peace.

Texts about military strategy take us back into the mists of time but what it is, and what the nature of war is, remains hotly debated. Antulio Echevarria II of the US Army War College talks us through key books, both old and new, on military strategy.

Churchill hailed the Allied victory at the Battle of El Alamein as “the end of the beginning” for Hitler in World War II. But in that very same speech, he downplayed its significance. Historian Simon Ball separates clichés from facts and chooses the best of the vast number of books written about El Alamein, the Desert War and World War II in general.

Which are the best books on American history? Brent Glass, Director Emeritus of the Smithsonian’s National Museum of American History, the world’s largest museum devoted to telling the story of America, chooses five standout books in a crowded field.

The introduction of drones “makes possible perpetual war without costs”, warns the anthropology professor and security expert Hugh Gusterson. Here he selects the best books that examine their ethical, psychological and political impact upon 21st century warfare.

What will the next global conflict look like? Two of America’s leading defence experts, P W Singer and August Cole, turned to science fiction to explore the prospect of a future war, and how existing technology might be used in one. Here, they choose five novels depicting a fictional World War Three that served as inspiration.

One out of every 122 people in the world today is displaced by conflict. David Miliband, president of the IRC, chooses five books to help us think constructively about refugees and the causes of the current crisis.

War writing extends to all sorts of genres, including blogs and Twitter. Oxford University’s Professor Kate McLoughlin, author of Authoring War: The Literary Representation of War from the Iliad to Iraq recommends some of her favourite books of war writing.

The philosopher argues that a culture of debate, in which people of all backgrounds can openly discuss the truth, is philosophy’s real answer to conflict.

It’s hard to remember when in the midst of one, but terrorism campaigns do always end. Audrey Kurth Cronin, author of How Terrorism Ends, recommends the best books on terrorism.

The war on terror relied on a fundamental misunderstanding of the nature of the threat, say author and academic Malise Ruthven. He picks the best books to get a better understanding of Islamism.

The historian and author of The Pursuit of the Nazi Mind, Daniel Pick, tells us what we can learn from attempts to use psychology, psychiatry and psychoanalysis to understand Nazism.

The veteran reporter and frequent visitor to Afghanistan tells us about the country he loves, and the Westerners (and Central Asian conqueror) who wrote engagingly about it.

The Russian revolution was the beginning of the modern age, says award-winning author Roland Chambers. He tells us what Solzhenitsyn imagined Lenin was like, and about the children’s author who led a double life as a spy in Bolshevik Russia.

Postwar Europe was a scene of both physical and moral destruction. Keith Lowe, author of the award-winning Savage Continent, recommends essential reading for understanding the sheer scale of suffering, dislocation and fighting after the war was over.

Historian and novelist James Holland talks us through some of his favourite memoirs and novels about the Second World War and explains his lifelong fascination with the global conflict.

It was a bloody conflict that divided Spain and drew in Hitler, Stalin and Mussolini. Later, it inspired great works of art and literature. An eminent historian of the period tells us why it continues to fascinate him

Genocide isn’t the preserve of fanatics and racist thugs – it’s part of human nature, says Stanford historian Norman Naimark. He tells us how genocide happens, who denies it, where it could return, and the best books to read about it.

Our TV screens may be full of news about war and crime, but this masks a fall in historical terms in the number of violent deaths that’s nothing short of astonishing, says Harvard psychologist Steven Pinker. He tells us how and why this happened. (This interview was updated 17 December, 2020, to include books that have come out since it was published in 2011)

When war comes, women pick up the pieces, providing for families and taking up jobs previously done by men. Increasingly, women are to be found on the frontlines of combat too, as the author and journalist explains

The neoconservative view that the US has a special mission in the world was supercharged by 9/11. There was also a sense that 9/11 could make America better. Sadly it didn’t work out that way, says Peter Beinart

The US has repeatedly misdiagnosed the war in Afghanistan. Former soldier, Andrew Exum, tells us about flawed policy, unhappy outcomes and what could and should have been different.

Jason Burke, journalist and author of an acclaimed book on Al-Qaeda, tells us what he learnt about militants when he was caught in a firefight in Iraq—and suggests five books we should read to understand their motivations.

The veteran Middle East correspondent gives us his tips for the best reading about the US-led invasion and occupation, and explains why the West shouldn’t have intervened in Iraq in the first place

The Middle East scholar tells us what to read if we’re to understand where upheaval in the Arab world came from, and where it’s going.

The professor of history at Cambridge asks why Oliver Cromwell remains Britain's most controversial ruler, and what the morbid story of Cromwell's head after his death has to say about British history.

To understand what makes integration fail or succeed we need to know why migrants moved in the first place, says Shahram Khosravi, Professor of Social Anthropology at Stockholm University and author of Young and Defiant in Tehran and ‘Illegal’ Traveller.

The veteran Dutch diplomat, Nikolaos van Dam, explains why meaningful political change in Syria will be difficult to achieve – and warns that any move towards democracy is likely to be accompanied by severe sectarian tension.

Before Vietnam, America fought in the Korean War—but its role in that conflict has been far less examined. Award-winning historian Bruce Cumings talks about the misconceptions many people still hold, and how they distort our understanding of the current North Korean regime.

Veteran diplomat Michael Palliser discusses his friend Henry Kissinger’s diplomatic skills and says his experiences in post-war Germany made him a committed European

‘Most people still live rather primitively, and that is not good from a purely economic point of view, but it’s very charming and the food is wonderful.’

David Cortright, Notre Dame peace studies expert, identifies and rejects one of the myths about non-violent action: that it only works in liberal democracies. He outlines that non-violent protests can achieve their aims, that terrorism can only cease through negotiation, and that wars rarely have winners.

The former FBI Chief Negotiator says that negotiators need to come across as non-threatening and non-judgmental. And active listening isn’t just something you use in a hostage situation; it’s important in everyday life, too