Witnesses are being sought to an assault on Mundy Street in Heanor which left a man with a broken collar bone.
The incident happened at about 9.55pm on Saturday, June 29, when the victim and alleged offender had an argument.
The 51-year-old victim was taken to hospital where he was treated for a broken collar bone and minor head injuries.
A 24-year-old man from Langley Mill was arrested at the scene and has been released on police bail while enquiries continue.
Anyone who witnessed the argument should contact PC Andrew Cocking on 101.