Why do so many corpses found in Europe’s peat bogs show signs of violent death?

Kristen C. French in Nautilus:

One Saturday in the spring of 1950, brothers Viggo and Emil Højgaard from the small village of Tollund, in Denmark, were cutting peat in a local bog when they uncovered a dead man. He looked as though he had only just passed away. His eyelashes, chin stubble, and the wrinkles in his skin were visible; his leather cap was intact. Suspecting murder, the brothers called the police in nearby Silkeborg, but the body wasn’t what it seemed.

Cracking the case required a special breed of forensic analysis. Famed Danish archaeologist Peter V. Glob, from the University of Aarhus, arranged for the body, along with its bed of peat, to be excavated and transferred to the Silkeborg Museum in a giant wooden box. An examination of the contents of the dead man’s stomach suggested—and radiocarbon dating later confirmed—that he had lived during the third century B.C., in the pre-Roman Iron Age. For more than 2,000 years, Tollund Man, as the corpse became known, had lain at the bottom of the bog, nearly untouched by time, as all of recorded history marched forward over his head.1

Since the 18th century, the peat bogs of Northern Europe have yielded hundreds of human corpses dating from as far back as 8,000 B.C. Like Tollund Man, many of these so-called bog bodies are exquisitely preserved—their skin, intestines, internal organs, nails, hair, and even the contents of their stomachs and some of their clothes left in remarkable condition.

More here.