It remains one of the biggest archaeological mysteries: why do so many hillforts, particularly across Scotland, appear to have undergone a significant burning event that caused their stone walls to melt and ultimately fuse (see CA 133)? Was it done deliberately, either during an attack or as a ceremonial act, or was it accidental? One of these ‘vitrified’ forts, Dun Deardail in Glen Nevis, was recently excavated over the course of a three-year project funded by Forestry Commission Scotland and the Heritage Lottery Fund as part of the Nevis Landscape Partnership. This Iron Age hillfort was built in the middle of the 1st millennium BC, around 2,500 years ago, and was eventually destroyed in a catastrophic fire. Now excavations have shed light on its construction, occupation, and destruction.