The National Trust info board says "The National Trust owns only the top of this hill which was a walled village of the Early Iron Age from about 300BC to 100BC. At first the area near the edge of the hilltop was cleared to a rock base on which substantial timber framed and wattle huts were built. A 20' wide rampart was then made faced inside and outside with well built dry stone walls and infilled with loose stones. The outer face was at least 12' high. After a period of occupation some of the huts were burnt down and the rampart was overthrown. The site was abandoned and never occupied again".
P.S. – The slopes of the hill (Little Solsbury Common) are administered by the Batheaston Freeholders Association.