Frank Kitson in Kenya (Still from ‘Kitson’s Class’ in documentary series War School, BBC One London, 9 January 1980)

      The British eventually suppressed the rebellion, but at a staggering human cost. Nobody knows precisely how many Kenyans were slaughtered, but the number may reach the hundreds of thousands. Some 1.5 million people were detained, many in internment camps. Mau Mau suspects were subjected, during interrogations, to electric shocks, cigarette burns and appalling forms of sexual torture. This brutal campaign did not forestall the British withdrawal from Kenya, in 1963. Yet, back in London, the operation against the Mau Mau was celebrated as a great success. Kitson had been awarded the Military Cross, for valour, in 1955, for his ‘gallant and distinguished services in Kenya’. ‘I wondered if perhaps some of my good fortune might have been due to the fact that I did think just a little bit more like a terrorist than some of our commanders,’ he mused afterwards. ‘I wondered how much of the African mentality I had absorbed. Was I becoming callous and ruthless and treacherous – to mention some of their less attractive characteristics?’

      Kitson had found his calling. There might be no more world wars to fight, but there were plenty of colonial insurgencies. In 1957, he ventured to Malaya, where he battled communist guerrillas in the jungles of Johore and was awarded a Bar to his Military Cross. From there he was dispatched to the Sultanate of Muscat and Oman, to contend with a rebellion in the desert. Next he did two stints in Cyprus, where Greek and Turkish Cypriots had gone to war, and was given command of his own battalion.

      In 1969, Kitson spent a quiet year away from the battlefield, on a fellowship at Oxford University. Amid the Gothic architecture and manicured quadrangles, he embarked on a new project: an effort to systematise his thinking about counter-insurgency. He studied Mao and Che Guevara and drew on his own combat experience, to produce a manuscript with the anodyne title Low Intensity Operations. In this book, Kitson advanced an argument that would become a cornerstone of later counter-insurgency thinking: it is important not merely to put down an uprising but to win the hearts and minds of the local population. The book also focused heavily on the gathering of intelligence. It made a point so obvious that it almost went without saying: if you want to defeat an insurgency, it helps to know who the insurgents are. By the time Kitson finished the book, in 1970, he had emerged as perhaps the pre-eminent warrior-intellectual of the British Army. When he finished at Oxford, he was promoted to brigadier and sent to the site of Britain’s latest small war: Northern Ireland.

      Army headquarters at Lisburn lay eight miles outside Belfast, behind fortified blast walls lined with sandbags and barbed wire. The number of British troops in Northern Ireland had escalated dramatically in a short period of time: during the summer of 1969, there were 2,700; by the summer of 1972 there were more than 30,000. The soldiers were often just as young and inexperienced as the paramilitaries they were fighting: gangly, pimply, frightened young men who were scarcely out of their teens. They were spread across the country, at bases and barracks and makeshift billets. Two companies of Black Watch soldiers were billeted in a vast aircraft hangar. Another company resided in a bus depot, where soldiers bunked down in empty buses. The soldiers were being deployed to Northern Ireland for four-month tours, before rotating home again.

      It could be a hugely dangerous assignment, with a multitude of armed factions blending into close-knit communities. In light of the constant risk of getting picked off by a sniper or torn apart by a homemade bomb, some of the more introspective soldiers were forced to wonder: What would success look like? How would you define victory? They had been sent to Northern Ireland to quell the unrest during the summer of 1969, but since their arrival, the bloodshed had only intensified. What would they have to achieve before they could all go home? The army that deployed in the Troubles was not the army that had fought the Nazis. It was an organisation that had come of age fighting small wars of colonial disentanglement. But what was Northern Ireland? Was it part of the United Kingdom? Or was it one of those restive colonies?

      When Frank Kitson arrived, in 1970, he was not the overall commander of British forces. But he was in charge of the army’s 39 Airportable Brigade, which had responsibility for Belfast, and his influence far exceeded his station. As one of Kitson’s subordinates later put it, ‘Within his area of responsibility he was the sun around which the planets revolved, and he very much set the tone.’

      The biggest challenge facing the army when Kitson arrived was a shortage of solid intelligence. The men and women who became paramilitaries, whether republican or loyalist, looked like everyone else in the civilian population. So how to identify them? In previous decades, the membership of the IRA had been relatively static – the same names came up year after year. But the old police files were in desperate need of an update, now that there were new recruits flocking to the cause every week. This difficulty was only exacerbated by the blunderbuss approach favoured by the army. ‘When I was first there, the tactics were rather to stand in a line, pump the place full of gas, and let people chuck bricks at you until they got tired of it,’ Kitson later recalled. ‘Not a very good idea because the gas did so much damage to the local people. It made them hostile.’

      In Low Intensity Operations, Kitson had observed that the aim in counter-insurgency situations should be to ‘destroy the subversive movement utterly’. But it’s difficult to destroy a target that you cannot see. Kitson became obsessed with intelligence. The first challenge is always ‘getting the right information’, he liked to say.

      In particular, Kitson was interested in D Company of the Belfast Brigade, the IRA unit operated by Brendan Hughes and the one that was doing the most damage. British soldiers referred to Hughes’s operational area in West Belfast as ‘the reservation’ – Indian country, where soldiers should tread carefully, if at all. Among themselves (and occasionally in the press) the soldiers would decry their adversaries’ lack of humanity, saying, ‘These people are savages.’ Hughes and his men were out there, invisible and silent, embedded in the community. At Palace Barracks, outside the city, where many of the soldiers were stationed, you could hear the bombs going off in Belfast at night. The windowpanes would shudder.

      With