History is usually told through wars, leaders, and major decisions. But sometimes a surprisingly small error changes what happens next.
1. The Austrian Army Fought Itself
During the Austro-Turkish War in 1788, Austrian troops became confused after a nighttime encounter involving soldiers, civilians, and conflicting orders.
Different units mistook each other for Ottoman attackers and began firing. The resulting chaos reportedly caused significant Austrian casualties before the actual Ottoman army even arrived. The episode became known as the Battle of Karansebes. Historians still debate some details of the story, but the incident is widely remembered as an extraordinary example of battlefield confusion.
2. A Wrong Number Helped Send the Titanic’s Distress Messages
After the Titanic struck an iceberg in 1912, wireless operators sent distress messages using the new international SOS signal as well as the older CQD call.
The tragedy helped expose serious weaknesses in maritime communications and contributed to international changes requiring ships to maintain continuous radio watches.
3. A Typo Created the “Wicked Bible”
In 1631, a London printing error accidentally omitted the word “not” from one of the Ten Commandments in about 1,000 copies of the King James Bible.
The printers were fined £300 and lost their license. Only a handful of copies are known to survive today. (British Library)
4. A Misprinted Map Helped Create a Fake Island
Mapmakers sometimes copied errors from earlier maps instead of checking them independently.
Isle Phelipeaux appeared on maps of the Great Lakes and was even referenced in the 1783 Treaty of Paris. When surveyors later searched for it, they discovered that the island simply did not exist. (National Geographic)
5. A Computer Unit Error Destroyed a Mars Mission
In 1999, NASA’s Mars Climate Orbiter was lost because one team used imperial units while another used metric units.
The spacecraft entered the Martian atmosphere incorrectly instead of reaching its intended orbit. The mistake cost the mission and became a classic lesson in engineering communication.
6. An Accidental Discovery Created a New Medicine
In the 20th century, researchers testing a drug for heart-related conditions noticed an unexpected effect and changed the direction of their research.
That compound eventually became sildenafil, better known by its brand name Viagra. The discovery is a famous example of scientific serendipity. (NIH)
Small errors don’t always change history. But when they intersect with complicated systems, their consequences can become enormous.