Police are appealing after a man was attacked near the Bedwas Bridge roundabout.
The man, who had just crashed his black BMW into a lamppost on the A468, was attacked by two men who were driving behind him in a blue Astra.
The two men punched and kicked the man, giving him cuts and bruises, before taking his wallet.
The incident happened at around 2.15am on Wednesday, April 3.
A 28-year-old man, who was arrested on suspicion of robbery, has since been bailed.
Police described the first offender as a heavily-built white man who was wearing a light coloured t-shirt, while the second offender is described as a white man with short spiked hair, who was wearing a tracksuit and trainers.
Anyone with information can contact Gwent Police on 101, quoting log 24 03/04/19.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.