The fortress features extensive defensive structures, including large ditches and earthen mounds, revealing significant human effort and strategic importance.
"Violence is a particularly common theme for later prehistoric human remains from watery places," said the head researcher.
Drone surveys revealed the fortress is over 40 times larger than previously thought, spanning more than 50 hectares.
The acquisition was announced four years after metal detectorist Mariusz Stepien uncovered the hoard in a field.
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