A 21-year-old woman was forced at knife-point to walk down a dirt track into woodland before being struck on the head and robbed in Berkshire.
The victim was walking from Pangbourne on the A329 when three men approached her at about 1300 BST on Wednesday.
One of the men, who was carrying a knife, forced her to go with the gang.
She blacked out after being hit on the head. When she came to, the men had fled and her money and jewellery had gone.