Originally, the rampart should have a length long enough to block the width of the hill and so, to protect a surface of approximately 7 hectares. The graves made on the site allowed to date the construction of the rampart at 50 BC approximately. The researches made on the plateau protected bay the rampart did not abble to determine precisely the function of the establishment. The most possible hypothesis is a military camp occupied during two generations.
A section of the rampart, restored in 1990, allows to see the structure of the rampart with its wooden framework and its facings built with stones. A model of the rampart is visible in the museum of Yverdon-les-bains et région.
Swiss topographic coordinates: 539'381, 178'723