On 12 October, a search team consisting of 60 police constables discovered a heavy, tapered bough of birchwood approximately 350 yards from the burial site. This bough had been sharpened at both ends, and was found just 16 yards from a military tripwire. Upon closer inspection, investigators noted several short strands of blonde human hair crushed into the bark, strongly indicating Wolfe had fallen to the ground at this location before her murderer had used this bough to inflict the vast depressed fracture to her skull. (This theory would be supported by Dr. Simpson, who confirmed the dimensions of this bough perfectly matched the cavity within the victim's skull, and that the hair samples upon the instrument matched those retrieved from her scalp.)