The Peaceful 1930s: A World Not Ready for War

The sun hung low over the apple orchards of Bavaria on the afternoon of August 17, 1937, gilding the edges of the leaves and turning the fallen fruit on the grass to streaks of amber and red. Ten-year-old Hans Müller wiped sweat from his forehead with the back of his grimy hand, the hem of his linen shirt stuck to his skin from hours of helping his grandfather pick the last of the season’s Gravenstein apples. The air smelled of ripe fruit, dry hay, and the faint, sharp tang of diesel from the road half a kilometer away, where the local farmer’s truck rumbled toward the village with its daily load of milk. Hans’s grandfather, a broad-shouldered man with a scar slicing across his left calf from a shrapnel wound in the Battle of Verdun, paused to lean on his picking ladder, his weathered face crinkling as he listened to a distant, unfamiliar hum cutting through the usual summer drone of cicadas and tractors.

“What’s that noise?” Hans asked, squinting at the cloudless blue sky. Most days, the only aircraft they saw were the lumbering Junkers transport planes that flew low over the orchards on their way to Munich, their propellers thumping like giant, slow heartbeat, leaving white contrails that hung in the sky for minutes after they passed. Children in the village would throw apple cores at them, laughing when the pilots sometimes waggled their wings in reply.

“Hush,” his grandfather said, shading his eyes with a calloused hand. A faint, sleek shape emerged from behind the distant stand of pine trees, moving far faster than any plane Hans had ever seen. It had no propellers at all. The noise was a sharp, high-pitched whine, like a giant angry mosquito, nothing like the deep throb of the Junkers’ engines. For less than a minute, it was visible, silver glinting in the sun, before it vanished behind the hills to the east, leaving only the fading echo of its strange engine.

“Did you see that?” Hans breathed, his picking basket slipping off his shoulder and spilling apples across the grass. “It had no propellers! How did it fly?”

His grandfather shook his head, climbing down the ladder to brush dirt off his trousers. “That’s a new test plane, from the Heinkel factory down the road. They’re experimenting with jet engines. Don’t go talking about it around the village, though—the party officials don’t like people asking questions about military projects. And for heaven’s sake, don’t draw it in your school notebook. Your teacher will think you’re making up stories.”

Hans nodded, but he couldn’t stop thinking about the silver plane as they walked back to the farmhouse that evening, the smell of his grandmother’s apple strudel drifting out to meet them. That night, under the glow of his coal-oil lamp, he pulled out his tattered sketchbook, filled with drawings of the Junkers planes he saw every day, and drew the sleek, propellerless machine he’d seen in the sky. He labeled it in careful, wobbly handwriting: *Flugzeug ohne Propeller*—plane without propellers. When he showed it to his teacher the next week, she frowned and shook her head, telling him airplanes had needed propellers since the Wright brothers flew in 1903, and he shouldn’t waste time on silly fairy tales. Hans tucked the drawing into the back of his notebook, vowing to himself that one day, he would build a plane that flew without propellers, even if no one believed it was possible.

Half a world away, on the windswept coast of Norfolk, England, twelve-year-old Molly Carter was kneeling in the sand at low tide, passing a coil of copper wire to her father as he hammered a wooden pole into the beach. It was September 12, 1937, and the tide had gone out far enough to expose the flat, hard-packed sand that stretched for miles along the shore, dotted with the rusting hulks of old fishing boats and the occasional shiny stone that Molly liked to collect. Her father, Robert Watson-Watt, was a tall, thin man with round wire-rimmed glasses and a habit of talking to himself when he was working on an experiment, and today he was building a new antenna for the radio research station where he worked.

“Hold it steady, Molly,” he said, wiping salt spray from his forehead with the sleeve of his wool sweater. “This coil has to be exactly three meters from the ground, or the signal won’t bounce right.” He held up a small, black vacuum tube that glowed faintly when he plugged it into a portable battery pack. “You know how we talk on the radio? The sound turns into invisible waves that fly through the air, right? Well, these waves are like tiny, invisible ping-pong balls. If they hit something hard—like a metal plane, or a ship, or even a big rock—they bounce right back. If we have a receiver that can catch the bounced waves, we can tell exactly where the thing is, even if we can’t see it.”

Molly frowned, holding the copper coil still as her father secured it to the pole with a piece of rope. “That sounds like magic. How can something invisible bounce?”

“Think of it like this,” her father said, grinning. He pulled a small flashlight out of his pocket and clicked it on, shining it at the wooden pole of the antenna. The light bounced off the wood and hit Molly’s face. “See? The light is invisible when it’s flying through the air, but when it hits something, you can see it bounce back. Radio waves are just like that, only you can’t see them with your eyes. We call this thing ‘radar’—short for ‘radio detection and ranging.’ It can find planes miles away, even in the dark, even if they’re hiding behind clouds.”

Molly’s eyes went wide. “Really? Can we test it?”

“Not today,” her father said, packing up his tools. “The Air Ministry says it’s a waste of money. They say if a German plane comes over, we’ll see it with our eyes just fine. They think the next war will be just like the last one—soldiers in trenches, horses pulling artillery, planes just used for scouting. They don’t think anyone would ever bomb cities from the sky.”

Molly frowned. She’d heard her mother crying late at night sometimes, talking about her little brother who’d died in the war, shot by a sniper in the trenches in France when he was only nineteen. She knew war was terrible, but she couldn’t imagine a war where planes would drop bombs on houses, on children. “But what if they’re wrong?” she asked.

Her father shrugged, slinging his toolbox over his shoulder as they walked back up the beach toward the road. “We’ll just keep working on it, eh? Even if no one believes it now, it’ll be ready when they need it.”

The world of the 1930s was a strange, contradictory place, full of bright promises of peace and quiet, unspoken warnings of something darker on the horizon. For most people living through it, the memory of World War I was still too raw, too painful, to even consider the possibility of another conflict. The Great War, as it was called, had killed more than 20 million people, left millions more wounded, and wiped out an entire generation of young men across Europe. Entire villages in France and Germany had no men left between the ages of twenty and forty. Grandmothers still kept photos of their dead sons on their mantelpieces, and fathers still woke up screaming from nightmares of trench warfare and gas attacks. No one wanted to go through that again.

In 1928, fifteen countries had signed the Kellogg-Briand Pact, also called the Pact of Paris, a treaty that promised all signatories would never use war as a way to solve disagreements between countries. By 1933, nearly every country in the world had signed it, including Germany, Britain, France, the United States, and Japan. Peace movements sprang up everywhere: in Britain, the Oxford Union passed a resolution in 1933 stating that they would “under no circumstances fight for their king and country,” a motion that was cheered by millions of people who saw it as a sign that the old, violent ways of the past were finally dying. In the United States, a group of college students wrote the “Peace Ple