The Secret War: Spies, Codes and Guerrillas 1939–1945. Max Hastings

were supposedly allies of Britain and the United States, but Stalin viewed this relationship with unremitting cynicism – as a merely temporary association, for the narrow purpose of destroying the Nazis, with nations that remained the Soviet Union’s historic foes and rivals.

Many books about wartime intelligence focus on what spies or codebreakers found out. The only question that matters, however, is how far secret knowledge changed outcomes. The scale of Soviet espionage dwarfed that of every other belligerent, and yielded a rich technological harvest from Britain and the United States, but Stalin’s paranoia crippled exploitation of his crop of other people’s political and military secrets. The most distinguished American historian of wartime codebreaking told me in 2014 that after half a lifetime studying the subject he has decided that Allied intelligence contributed almost nothing to winning the war. This seems too extreme a verdict, but my friend’s remarks show how scepticism, and indeed cynicism, breed and multiply in the course of decades wading in the morass of fantasy, treachery and incompetence wherein most spymasters and their servants have their being. The record suggests that official secrecy does more to protect intelligence agencies from domestic accountability for their own follies than to shield them from enemy penetration. Of what use was it – for instance – to conceal from the British public even the identities of their own spy chiefs, when for years MI6’s* most secret operations were betrayed to the Russians by Kim Philby, one of its most senior officers? The US government repudiated a bilateral intelligence exchange agreed with the NKVD* by Maj. Gen. William Donovan of OSS, but official caution did little for national security when some of Donovan’s top subordinates were passing secrets to Soviet agents.

      Intelligence-gathering is not a science. There are no certainties, even when some of the enemy’s correspondence is being read. There is a cacophony of ‘noise’, from which ‘signals’ – truths large and small – must be extracted. In August 1939, on the eve of the Nazi–Soviet Pact, a British official wrung his hands over the confused messages reaching the Foreign Office about relations between Berlin and Moscow: ‘We find ourselves,’ he wrote – using words that may be applied to most intelligence – ‘when attempting to assess the value of these secret reports, somewhat in the position of the Captain of the Forty Thieves when, having put a chalk mark on Ali Baba’s door, he found that Morgana had put similar marks on all the doors in the street and had no indication which was the true one.’

      It is fruitless to study any nation’s successes, its pearls of revelation, in isolation. These must be viewed in the context of hundreds of thousands of pages of trivia or outright nonsense that crossed the desks of analysts, statesmen, commanders. ‘Diplomats and intelligence agents, in my experience, are even bigger liars than journalists,’ wrote the British wartime spy Malcolm Muggeridge, who was familiar with all three, and something of a charlatan himself. The sterility of much espionage was nicely illustrated by František Moravec of Czech intelligence. One day in 1936 he proudly presented his commanding officer with a report on a new piece of German military equipment, for which he had paid an informant handsomely. The general skimmed it, then said, ‘I will show you something better.’ He tossed across his desk a copy of the magazine Die Wehrmacht, pointed out an article on the same weapon, and said dryly, ‘The subscription is only twenty crowns.’

      In the same category fell the Abwehr transcript of a December 1944 US State Department message appointing a new economic affairs counsellor to the Polish exile government in London. This read, in part: ‘His transportation expenses and per diem, Tunis to London, via Washington, DC, transportation expenses and per diem for his family and shipment effects direct authorised, subject Travel Regulations.’ A page-long translation of this decrypt was stamped ‘Top Secret’ by its German readers. The man-hours expended by the Nazi war machine to secure this gem reflect the fashion in which intelligence services often move mountains to give birth to mice.

      Trust is a bond and privilege of free societies. Yet credulity and respect for privacy are fatal flaws to analysts and agent-runners. Their work requires them to persuade citizens of other countries to abandon the traditional ideal of patriotism, whether for cash, out of conviction, or occasionally because of a personal bond between handler and informant. It will always be disputed territory, whether those who betray their society’s secrets are courageous and principled heroes who identify a higher loyalty, as modern Germans perceive the anti-Hitler Resistance, or instead traitors, as most of us classify Kim Philby, Alger Hiss – and in our own times Edward Snowden. The day job of many intelligence officers is to promote treachery, which helps to explain why the trade attracts so many weird people. Malcolm Muggeridge asserted disdainfully that it ‘necessarily involves such cheating, lying and betraying, that it has a deleterious effect on the character. I never met anyone professionally engaged in it whom I should care to trust in any capacity.’

      Stalin said: ‘A spy should be like the devil; no one can trust him, not even himself.’ The growth of new ideologies, most significantly communism, caused some people to embrace loyalties that crossed frontiers and, in the eyes of zealots, transcended mere patriotism. More than a few felt exalted by discovering virtue in treason, though others preferred to betray for cash. Many wartime spymasters were uncertain which side their agents were really serving, and in some cases bewilderment persists to this day. The British petty crook Eddie Chapman, ‘Agent ZigZag’, had extraordinary war experiences as the plaything of British and German intelligence. At different times he put himself at the mercy of both, but it seems unlikely that his activities did much good to either, serving only to keep Chapman himself in girls and shoe leather. He was an intriguing but unimportant figure, one among countless loose cannon on the secret battlefield. More interesting, and scarcely known to the public, is the case of Ronald Seth, an SOE agent captured by the Germans and trained by them to serve as a ‘double’ in Britain. I shall describe below the puzzlement of SOE, MI5, MI6, MI9 and the Abwehr about whose side Seth ended up on.

      Intelligence-gathering is inherently wasteful. I am struck by the number of secret service officers of all nationalities whose only achievement in foreign postings was to stay alive, at hefty cost to their employers, while collecting information of which not a smidgeon assisted the war effort. Perhaps one-thousandth of 1 per cent of material garnered from secret sources by all the belligerents in World War II contributed to changing battlefield outcomes. Yet that fraction was of such value that warlords grudged not a life nor a pound, rouble, dollar, Reichsmark expended in securing it. Intelligence has always influenced wars, but until the twentieth century commanders could discover their enemies’ motions only through spies and direct observation – counting men, ships, guns. Then came wireless communication, which created rolling new intelligence corn prairies that grew exponentially after 1930, as technology advanced. ‘There has never been anything comparable in any other period of history to the impact of radio,’ wrote the great British scientific intelligence officer Dr R.V. Jones. ‘… It was the product of some of the most imaginative developments that have ever occurred in physics, and it was as near magic as anyone could conceive.’ Not only could millions of citizens build their own sets at home, as did also many spies abroad, but in Berlin, London, Washington, Moscow, Tokyo electronic eavesdroppers were empowered to probe the deployments and sometimes the intentions of an enemy without benefit of telescopes, frigates or agents.

      One of the themes in this book is that the signals intelligence war, certainly in its early stages, was less lopsided in the Allies’ favour than popular mythology suggests. The Germans used secret knowledge well to plan the 1940 invasion of France and the Low Countries. At least until mid-1942, and even in some degree thereafter, they read important Allied codes both on land and at sea, with significant consequences for both the Battle of the Atlantic and the North African campaign. They were able to exploit feeble Red Army wireless security during the first year of Operation ‘Barbarossa’. From late 1942 onwards, however, Hitler’s codebreakers lagged ever further behind their Allied counterparts. The Abwehr’s attempts at espionage abroad were pitiful.

      The Japanese government and army high command planned their initial 1941–42 assaults on Pearl Harbor and the European empires of South-East Asia most efficiently, but thereafter treated intelligence with disdain, and waged war in a fog of ignorance about their