Police are appealing for witnesses following reports of an assault in London Road, Stanford-le-Hope.
Officers were called at around 6.30pm on Tuesday September 1 to reports of an altercation between two men.
A white van was reported to have pulled up and a man described as in his 20s, 6ft tall with long black hair tied up in a bun, got out the vehicle.
An altercation then took place between him and a man in his 20s, who was hit over the head.
The victim was taken to hospital with a head injury.
If anyone was in the area and saw what happened, has CCTV or dash cam footage please call Grays CID on 101 quoting crime reference 42/138765/20 or you can report it online at www.essex.police.uk