A 25-year-old was arrested on suspicion of ABH after a man was head-butted in Crawley.
The 47-year-old victim was attacked when he and his wife attempted to pass by a group of men in Pegler Way at around 9.50am on Tuesday May 6.
A spokesman for Sussex Police said one of the group head-butted the victim.
The spokesman added: “A 25-year-old man from Crawley was arrested nearby a few minutes later on suspicion of assault causing actual bodily harm.
“He was later bailed until June 3.”