An accidental Iron Age discovery
In November 1857, a fisherman named Hansli Kopp was navigating the shallow northern waters of Lake Neuchâtel, Switzerland. He was working for Colonel Friedrich Schwab, a local collector of antiquities, during a period of intense interest in lakeside dwellings that was nicknamed "lake-dwelling fever". Kopp noticed a series of wooden piles in an area called La Tène and, within an hour of investigating, pulled around 40 iron objects from the water, including a dozen swords and eight spearheads.
This was just the beginning. Subsequent investigations, aided by the first "Jura water correction" in the 1870s which lowered the lake level by 2.7 meters, revealed one of Europe's most significant Iron Age sites. What Kopp had found was not a settlement, but a massive collection of ritually deposited objects. In total, around 2,500 main artifacts were recovered from the site. This discovery was so definitive for the period that it became the "type site" for the later European Iron Age; archaeologists now refer to the "La Tène culture" which spans from roughly 450 BCE to the Roman conquest in the 1st century BCE.
An arsenal offered to the water
The objects from La Tène are mostly military. The collection includes iron swords, many still in their decorated scabbards, spearheads, shield bosses, and even parts of chariots and a wooden bow. Beyond weaponry, finds include tools like axes and knives, personal adornments such as brooches, and parts of horse harnesses. The waterlogged, low-oxygen environment of the lake bed preserved organic materials exceptionally well, including items of wood, cloth, and leather that would normally decay.
Many of the swords were deliberately bent or broken. This act is interpreted as a form of ritual "killing" of the object, rendering it unusable in the human world before offering it to the gods. The ancient Celts, who inhabited this region during the La Tène period, viewed bodies of water as the supernatural world. The deposits at La Tène are thought to be votive offerings, perhaps given over many generations to thank deities for victories or to ensure future success in battle. Human and animal bones found among the weapons suggest that sacrifices may have accompanied these offerings. Interpretations vary, with some scholars suggesting it could be the remains of a single event, such as the trophy from a defeated army offered by the victors.