Most of us learn that World War II began on 1 September 1939. What if I told you a secret German commando unit jumped the gun, invading Poland six days early?

This is the Jabłonków Incident, a bizarre opening act to the world’s deadliest conflict. It’s a tale of failed orders, fierce resistance, and a single telephone call that stopped a war, but only for a few days. This forgotten skirmish provides a chilling warning for our own times.

Ready to uncover one of WWII’s best-kept secrets?

The Strategic Chessboard: Why a Single Tunnel Mattered So Much

To understand why Germany risked a secret mission before a full-scale invasion, you need to look at a map. The Jabłonków Pass was a vital artery connecting Poland and German-controlled territory¹ in modern-day Czechia. It carried a railway line and a 300-metre-long tunnel through the Carpathian mountains. For the German war machine, this tunnel was a golden ticket. It offered the most direct route for Army Group South to pour troops from Vienna straight towards Warsaw².

Germany’s invasion of Poland, codenamed Fall Weiss (EN: Case White)^{3 4}, relied on speed and surprise. The next pincer of the attack, from the south, led by General Wilhelm List’s 14th Army^{5 6 7}, had a crucial job^{8 9}:

• Sweep into south Poland
• Capture the ancient city of Krakow
• Outflank the main Polish forces.

Capturing the Jabłonków tunnel intact was not just an advantage; it was essential to this plan. Without it, German armour and infantry would be delayed, giving the Polish army precious time to organise its defences. The Germans knew this, and so did the Poles.

Cound such a small railway tunnel hold the key to a country’s fate?

Poland – Ready for a Fight

The Polish military was aware of the threat and prepared for the worst. Understanding the immense strategic value of the pass¹⁰, Polish engineers mined the tunnel¹¹ months before¹². Their plan was simple but effective: if the Germans came, destroy the tunnel. This would turn the strategic gateway into a pile of rubble and a major roadblock. This foresight shows Poland’s military was not naive in the face of superior military hardware. They were ready to put up a determined and intelligent defence of their homeland.

The Incident Unfolds

At 21.30¹³ of 25 August 1939¹⁴, Adolf Hitler took a last-minute decision¹⁵. The UK had signed a military alliance with Poland^{16 17 18}, shattering his hope that the West would do nothing¹⁹. Furious, he delayed the invasion of Poland, which he had scheduled for the next morning^{20 21}. The message to stand down went out across the German military²². But in the chaos, one unit never got the call²³.

A small, elite group of about 24 German commandos²⁴, known as the “Brandenburgers,”²⁵ was already on the move. Led by Lieutenant Dr. Hans-Albrecht Herzner^{26 27}, their mission was to seize the Mosty railway station^{28 29} and the all-important tunnel before the main invasion force arrived³⁰. Dressed in civilian clothes to blend in, they crossed the border just at 00:30³¹ on 26 August^{32 33} and headed for their target.

Things went wrong almost immediately. The German force got lost in the unfamiliar, dark forests and split up³⁴. When Herzner’s depleted group finally attacked the station at 4 a.m.³⁵, they were met with stiff resistance from Polish border guards^{36 37} and soldiers from the 4th Podhale Rifle Regiment . After a chaotic firefight, the Germans managed to capture the station building. But as Herzner, the only one in a German uniform³⁸, confronted the captured Polish officer in charge³⁹, he was met with a confusing reply. When asked why they were fighting, the Pole calmly stated that their countries were not at war⁴⁰ and suggested Herzner could use the station’s telephone to confirm it himself⁴¹.

In that moment, Herzner must have realised something was terribly wrong. The telephone worked because his unit had failed to cut the lines, and a quick-thinking Polish telephone operator had already used it to warn the guards at the tunnel⁴². The primary objective was lost. A short time later, a furious call came through from German command, ordering Herzner to release his prisoners and retreat immediately⁴³. The premature invasion was over⁴⁴.

A Glimpse of What Was to Come

The Jabłonków Incident, though a failure for the Germans, served as a final, undeniable warning to Poland. The Polish military accelerated its secret mobilisation efforts⁴⁵, and by the time the real invasion began on 1 September, three-quarters of its armed forces were activated⁴⁶. The German government tried to dismiss the event, with a general sending an official apology claiming a “crazed individual” was responsible⁴⁷. But the Poles knew the truth.

When the Wehrmacht finally swarmed across the border on 1 September, the Poles were ready at Jabłonków⁴⁸. Less than an hour into the invasion, they detonated the explosives, and the tunnel collapsed⁴⁹. The objective of Herzner’s failed raid was denied to the main German army, proving the value of both Polish preparedness and the early warning the incident provided.

Some of the Nazi death marches started from close by.

This skirmish was one of several deceptive operations, like the more famous Gleiwitz incident, where German SS troops staged a fake attack on a German radio station to create a pretext for war^{50 51 52}. It shows a clear pattern of deception designed to paint Poland as the aggressor. As Hitler himself told his commanders, “I will give a propagandistic cause for the release of war, whether convincing or not. The winner is not asked later whether he said the truth or not”⁵³.

Czech war heros – for both sides – lived close by as well.

Could a Small Spark Ignite a Modern War?

It’s easy to look back at a seemingly minor event like the Jabłonków Incident and dismiss it as a historical footnote. But it raises a chilling question: could a similar small-scale border clash between major powers escalate into all-out war today? In a world of nuclear weapons and instantaneous communication, you might think the answer is no. But we have a recent and clear example that shows just how close we can come.

In June 2020, in the Galwan Valley of the Himalayas, soldiers from two nuclear-powered nations, China⁵⁴ and India⁵⁵, clashed in a brutal, hand-to-hand battle. The conflict, sparked by disputes over infrastructure construction⁵⁶ along their contested border, was fought not with guns⁵⁷, but with rocks, clubs, and fists . Twenty Indian soldiers⁵⁸ and at least four Chinese soldiers were killed in the fighting, which took place in treacherous⁵⁹, high-altitude terrain⁶⁰. It was the first fatal clash between the two giants in 45 years⁶¹.

Like the Jabłonków Incident, the Galwan Valley clash was a small-scale engagement in a remote, disputed border region over a point of strategic importance. It could have spiralled out of control. What prevented a wider war was a series of urgent diplomatic talks and a mutual, if reluctant, decision to de-escalate. Unlike in 1939, modern communication channels allowed the two powers to step back from the brink. However, the incident shattered relations, led to massive troop build-ups, and triggered economic retaliation, with India banning over 200 Chinese mobile apps .

We also can draw parallels with the war in the Ukraine, or Hamas’ attack in Israel in 2023.

The parallel is a stark reminder that even in the 21st century, the line between a border skirmish and a major conflict is dangerously thin. The Jabłonków Incident may have been a ridiculous failure, but its modern echoes in places like the Himalayas show that the lessons of history are more relevant than ever. The next time a small “incident” flashes across your news feed from a contested border, remember the story of Lieutenant Herzner and his commandos.

Sometimes, the smallest sparks can threaten to start the biggest fires.

References

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