The Strange Crossword That Contained the Secrets of D-Day

“They turned me inside out. But they eventually decided not to shoot us after all.” - Leonard Dawe

In the spring of 1944 Britain was preparing for one of the most important military operations in history. Hundreds of thousands of Allied soldiers were gathering across southern England, ships were being prepared, aircraft assembled and an enormous invasion force was waiting for the order to cross the English Channel. Everything depended upon secrecy. If Germany discovered where and when the invasion would take place, the consequences could have been catastrophic. So imagine the horror within British intelligence when some of the most secret words associated with the entire operation began appearing in the crossword of The Daily Telegraph.

This was not one vague military word that could easily be dismissed as coincidence. Over a matter of weeks the crossword contained Utah, Omaha, Overlord, Mulberry and Neptune. Other suspicious words associated with the invasion, including Gold, Juno and Sword, had appeared as well. To anybody who knew what those words actually meant, this looked less like a crossword and more like somebody publishing the invasion plan one clue at a time. The man responsible was Leonard Dawe, a respectable school headmaster who also happened to write crosswords for The Daily Telegraph as a job on the side. Dawe was headmaster of Strand School, which had been evacuated from London to Effingham in Surrey because of the war. By all appearances he was one of the least likely German spies imaginable. Unfortunately for him, his crossword was beginning to suggest otherwise.

The first major alarm came on 2nd of May 1944 when the answer Utah appeared. Utah was the codename for one of the American landing beaches planned for Normandy. On 22nd of May, Omaha appeared. This was another American landing beach and would eventually become the scene of some of the bloodiest fighting on D-Day. At this point it was still possible to argue coincidence. Utah was an American state and Omaha was an American city. Neither word was inherently suspicious on its own.

Then things became considerably more difficult to explain. On 27th of May, the word Overlord appeared. Operation Overlord was the codename for the entire Allied invasion of Normandy. Three days later, on 30th of May, Mulberry appeared. Mulberry was the name given to the enormous artificial harbours that were being secretly constructed so that Allied forces could unload supplies onto the Normandy beaches after the invasion. Then, on 1st of June, Neptune appeared. Operation Neptune was the naval phase of the D-Day landings. D-Day would begin on 6th of June 1944. Somebody at MI5 understandably began asking questions.

Britain had spent years attempting to convince Adolf Hitler that the invasion might occur somewhere other than Normandy. An enormous deception operation had been created involving fake armies, inflatable tanks, false radio transmissions and even General George Patton commanding a fictional invasion force supposedly preparing to attack around Calais. Meanwhile, a school headmaster in Surrey appeared to be placing words such as Overlord and Neptune into a national newspaper. It gets worse. This was not the first time Leonard Dawe had accidentally attracted the attention of British intelligence. In August 1942, shortly before the disastrous Allied raid on the French port of Dieppe, one of his crossword clues had produced the answer Dieppe. The raid followed soon afterwards. An investigation concluded that it had been an extraordinary coincidence. Two years later, coincidence was becoming increasingly difficult to swallow.

MI5 officers arrived at Dawe's home and began questioning him. They also investigated Melville Jones, another Telegraph crossword compiler. Dawe later described the experience with characteristic understatement, saying that intelligence officers had “turned me inside out” before deciding not to shoot him after all. One can imagine the conversation. Somewhere inside MI5 was a list containing some of the most highly classified words in Britain, and beside them was another list showing those exact words appearing in Leonard Dawe's crossword. Dawe's problem was that he apparently had absolutely no idea what any of them meant.

Overlord could simply describe somebody in authority. Neptune was the Roman god of the sea. Mulberry was a fruit. Utah and Omaha were American place names. Individually there was nothing extraordinary about putting any of them into a crossword. Put them together during the month immediately before D-Day and suddenly the headmaster of a Surrey school begins looking rather more interesting. Eventually MI5 accepted that Dawe was not a German spy. No evidence could be found that he had deliberately attempted to communicate military secrets, and the investigation was closed. The official explanation was essentially that Britain had just experienced one of the most extraordinary coincidences of the Second World War.

There was, however, another explanation. Leonard Dawe had a peculiar method of constructing some of his crosswords. Rather than personally filling every empty space in a crossword grid, he would sometimes invite boys from his school into his study and ask them to suggest words that fitted. The boys supplied the words, and Dawe would later create clues around them. This made his job slightly easier. It also potentially explains how some of the most secret military codewords in Europe ended up in The Daily Telegraph.

During the war Strand School had been evacuated to Effingham, and nearby were American and Canadian troops preparing for the invasion of Europe. Soldiers and local schoolboys inevitably came into contact with one another. The boys apparently heard military words being used around the camps and repeated them without having the slightest idea what they actually represented. To a 14-year-old boy, Overlord was simply an interesting word. To MI5, it was one of the most important secrets in Britain.

The explanation did not emerge publicly until decades later. In 1984, a former Strand School pupil named Ronald French came forward and claimed that he had been one of the boys responsible. French said Dawe would occasionally invite pupils into his study and allow them to fill empty spaces in crossword grids. He claimed that he had picked up unusual words from soldiers camped nearby and simply inserted them wherever they fitted. French apparently knew words such as Utah, Omaha, Overlord and Neptune but did not understand their significance. Nor, according to his account, did the soldiers necessarily explain what they meant. This is an important distinction. Knowing the word Omaha did not mean knowing that thousands of American soldiers were going to land on a particular stretch of Normandy coastline on the morning of 6th of June.

Nevertheless, the fact that the words were apparently circulating among schoolboys raises an uncomfortable question about wartime secrecy. The British government spent enormous resources trying to prevent Germany discovering the invasion plan, yet some of its most sensitive codewords may have been casually spoken around military camps loudly enough for local children to remember them. If French's account was accurate, one of the greatest military secrets of the 20th century had somehow escaped the carefully controlled world of military planning and entered a schoolboy's vocabulary.

The story becomes even stranger when French described what happened after Dawe discovered where the words had originated. According to French, the headmaster demanded to see the boy's notebook. Inside were numerous military expressions he had collected from conversations with soldiers. Dawe suddenly realised exactly what had happened and, presumably, why MI5 had recently been considering whether he was engaged in treason. His reaction was immediate. French later claimed that Dawe ordered him to burn the notebook and made him swear on the Bible that he would never reveal the story. Considering Britain was still at war and Dawe had recently been interrogated by the security services, his concern is understandable. Having escaped being labelled a German spy once, he probably had very little enthusiasm for explaining that his school pupils were wandering around collecting secret military terminology from Allied soldiers.

There is, however, a difficulty with this wonderfully neat explanation. Ronald French did not publicly tell his story until forty years after D-Day. Leonard Dawe had died in 1963 and could therefore neither confirm nor dispute the details. The original MI5 investigation established that Dawe was not deliberately leaking information, but the schoolboy explanation rests heavily upon French's later recollection. This leaves the story with exactly the right amount of mystery.

There is no serious evidence that Dawe was a German agent. Had he actually wanted to transmit information to Nazi intelligence, placing highly classified codewords into one of Britain's most popular newspapers would have been an extraordinarily unsubtle method of doing so. A secret agent normally attempts to remain secret. Publishing the word Overlord in The Daily Telegraph shortly before Operation Overlord would be rather like hiding a bank robbery by putting the date and address in tomorrow's newspaper.

Coincidence, however, is also difficult to accept completely. Utah. Omaha. Overlord. Mulberry. Neptune. Gold. Juno. Sword. All words associated with the Normandy invasion and all appearing within crosswords produced around the period when the operation was being prepared. The schoolboys provide the missing link. If Ronald French's account was accurate, the mystery becomes much less sinister but arguably even more extraordinary. The soldiers knew the words but presumably did not think the children understood them. The children remembered the words but did not know what they meant. Dawe used them because they fitted his crossword. The newspaper printed them because there appeared to be nothing unusual about them.

MI5, unfortunately, knew exactly what they meant.

There is also something wonderfully British about the entire episode. While the Allies were preparing thousands of aircraft, warships and landing craft for the invasion of Nazi-occupied Europe, British intelligence found itself investigating whether Germany was receiving secret information through the crossword section of The Daily Telegraph. Thankfully, there is no evidence that German intelligence noticed the pattern or understood its significance. D-Day began on 6th of June 1944 and the Allied armies successfully established themselves in Normandy. Operation Overlord became the beginning of the liberation of Western Europe and ultimately helped bring Nazi Germany to defeat.

Leonard Dawe returned to the considerably less dangerous business of educating schoolboys and writing crosswords. The story remains remarkable because of how close apparently meaningless information came to something enormously important. A boy hears a soldier say an unusual word. He writes it down because he likes the sound of it. His headmaster needs a word containing the correct number of letters. The word appears in a crossword. Somewhere in London, an intelligence officer almost falls off his chair.

Perhaps the most remarkable part is that the German intelligence services apparently failed to notice what British schoolboys had accidentally discovered. For all the spies, double agents, fake armies and elaborate deception operations surrounding D-Day, one of the greatest security scares of the invasion may have begun with something considerably simpler: a headmaster needed a word for his crossword, and one of his pupils happened to know exactly the wrong one.