A man was taken to hospital with head injuries after being attacked with what is believed to be a hammer.
Police were called to Moss Lane between Burscough and Rufford at around 11am on Tuesday, following reports of an assault near the Old Mill Nurseries.
They said a 21-year-old man from Liverpool was arrested at the scene on suspicion of affray and section 18 wounding. He is currently in custody.
The victim was taken to Southport Hospital for treatment.
His injuries are not thought to be life threatening.