Police said the 36-year-old had been involved in a "disturbance" with another man while in the garden of The Crown, which is on the High Street.
When he left the pub at 12.30am, he was assaulted by at least two men, one of whom he believes was involved in the earlier incident.
Police would like to hear from anyone with any information about the incident.
Officers can be contacted on 01732 379217 or Kent Crimestoppers on 0800 555 111.
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