Ancient Iron Bars Found in Danube Could Equip an Army

Archaeologists have analyzed a collection of 500 iron bars likely lost in a Danube River shipwreck 2,200 years ago. The find represents the largest mass discovery of prehistoric iron bars ever made in Europe.

Workers extracting gravel near the village of Deinham in Austria spotted unusual double-pointed iron objects in 2019. They reported the find to the Austrian monument authority, preventing the material from being lost to scrap dealers. It is nothing short of a minor miracle that the largest mass find of prehistoric iron bars in Europe did not end up at scrap dealers, said Peter Trebsche, an archaeologist at the University of Innsbruck and a study co-author.

The Scale of the Find

From hundreds of fragments recovered from gravel heaps, researchers identified 193 complete iron bars and 307 partial ones. The complete bars averaged 11.2 inches (28.5 centimeters) in length and weighed around 4.5 pounds (2 kilograms) each. The total weight of the recovered metal was approximately 2,200 pounds (1 metric ton).

A Semifinished Cargo

The bars were not finished products. They were semifinished ingots, rough-shaped for a blacksmith to later forge into tools or weapons. Peter Trebsche stated this quantity of iron would have been sufficient to forge about 500 swords. "The iron from Deinham would have been sufficient to equip a large group of warriors with weapons," he said. Alternatively, it could have produced up to 8,000 iron nails.

The original archaeological context was destroyed during the gravel extraction, making it impossible to determine precisely how the iron ended up in the river. The researchers, Trebsche and co-author Marion Berranger from the University of Technology of Belfort-Montbéliard, noted that while ritual deposition cannot be ruled out, most studies conclude such river finds are losses from transport. Waterways were the primary means for moving heavy goods before the invention of trains.

Origins and Trade Implications

If the bars were lost in a shipwreck, they were likely produced upstream from the find site. Similar iron bars have been discovered in Manching, Germany, roughly 125 miles (200 kilometers) away. This suggests the Deinham bars may have been forged in Bavaria. Researchers are analyzing elemental traces in the metal to clarify its geographical origin.

The find highlights the advanced economic capacities of the Late Iron Age. "It is incredible that such a large quantity of iron was transported at once and was available in a single exchange transaction," Trebsche said. According to the study published in Antiquity, this cargo demonstrates the increased scale of iron production reached in the Danube region during the third and second centuries B.C.