At the height of the British Empire, just after the First World War, an island smaller than Kansas controlled roughly a quarter of the world’s population and landmass. To the architects of this colossus, the largest empire in history, each conquest was a moral achievement. Imperial tutelage, often imparted through the barrel of an Enfield, was delivering benighted peoples from the errors of their ways—child marriage, widow immolation, headhunting. Among the edifiers was a Devonshire-born rector’s son named Henry Hugh Tudor. Hughie, as he was known to Winston Churchill and his other chums, pops up so reliably in colonial outposts with outsized body counts that his story can seem a “Where’s Waldo?” of empire.

He’s Churchill’s garrison-mate in Bangalore in 1895—a time of “messes and barbarism,” the future Prime Minister complained in a note to his mum. As the century turns, Tudor is battling Boers on the veldt; then it’s back to India, and on to occupied Egypt. Following a decorated stint as a smoke-screen artist in the trenches of the First World War, he’s in command of a gendarmerie, nicknamed Tudor’s Toughs, that opens fire in a Dublin stadium in 1920—an assault during a search for I.R.A. assassins which leaves dozens of civilians dead or wounded. Prime Minister David Lloyd George delights in rumors that Tudor’s Toughs were killing two Sinn Féinners for every murdered loyalist. Later, even the military’s chief of staff marvelled at how nonchalantly the men spoke of those killings, tallying them up as though they were runs in a cricket match; Tudor and his “scallywags” were out of control. It didn’t matter: Churchill, soon to be Secretary of State for the Colonies, had Tudor’s back.

Imperial subjects, of course, sometimes found their own solutions to such problems. A hard-line British field marshal, atop the I.R.A. hit list, was gunned down in Belgravia in 1922. Tudor, worried he would be next, made himself scarce. By the following year, he and his Irish paramilitaries were propagating their tactics for suppressing natives in the British-controlled Mandate of Palestine, Churchill having decided that the violence-prone Tudor was just the fellow to train the colonial police. A letter from Tudor to Churchill that I recently came across crystallizes all the insouciance, cynicism, greed, callousness, and errant judgment of empire. He opens by telling Churchill that he’s just commanded his troops to slaughter Adwan Bedouins who had been marching on Amman to protest high taxes levied on them by their notoriously extravagant emir. This tribe was “invariably friendly to Great Britain,” Tudor writes, a touch ruefully. But, he adds, “politics are not my affair.”

Tudor had cheery news to impart, too. Not only could the Mandate be a “wonderful tourist country,” but prospectors had discovered vast sums’ worth of potash in the Dead Sea valley. Should Britain appropriate the resources and increase the policing budget, its difficulties in the region would “smooth out,” he told Churchill, assuring him that Palestinians would be easier to pacify than the Irish: “They are a different people, and it’s unlikely that the Arab if handled firmly will ever do much more than agitate and talk.”

In the twentieth century’s hierarchy of state-sponsored violence, Hitler’s Germany, Stalin’s Russia, and Hirohito’s Japan typically take top spots. The actions of a few European empires have invited harsh scrutiny, too—Belgium’s conduct in Congo, France’s in Algeria, and Portugal’s in Angola and Mozambique. Britain is rarely seen as among the worst offenders, given a reputation for decency that the Harvard historian Caroline Elkins has spent more than two decades trying to undermine. “Legacy of Violence” (Knopf), her astringent new history of the British Empire, brings detailed context to individual stories like Tudor’s. Visiting archives in a dozen countries over four continents, examining hundreds of oral histories, and drawing on the work of social historians and political theorists, Elkins traces the Empire’s arc across centuries and theatres of crisis. As the sole imperial power that remained a liberal democracy throughout the twentieth century, Britain claimed to be distinct from Europe’s colonial powers in its commitment to bringing rule of law, enlightened principles, and social progress to its colonies. Elkins n the twentieth century’s hierarchy of state-sponsored violence, Hitler’s Germany, Stalin’s Russia, and Hirohito’s Japan typically take top spots. The actions of a few European empires have invited harsh scrutiny, too—Belgium’s conduct in Congo, France’s in Algeria, and Portugal’s in Angola and Mozambique. Britain is rarely seen as among the worst offenders, given a reputation for decency that the Harvard historian Caroline Elkins has spent more than two decades trying to undermine. “Legacy of Violence” (Knopf), her astringent new history of the British Empire, brings detailed context to individual stories like Tudor’s. Visiting archives in a dozen countries over four continents, examining hundreds of oral histories, and drawing on the work of social historians and political theorists, Elkins traces the Empire’s arc across centuries and theatres of crisis. As the sole imperial power that remained a liberal democracy throughout the twentieth century, Britain claimed to be distinct from Europe’s colonial powers in its commitment to bringing rule of law, enlightened principles, and social progress to its colonies. Elkins contends that Britain’s use of systematic violence was no better than that of its rivals. The British were simply more skilled at hiding it.