A teenager has been charged with grievous bodily harm after a 17-year-old was injured in Queen's Park in Chesterfield.
Police were called to the park on the afternoon of October 5 last year and found the injured youth. He was taken to hospital for treatment.
A 17-year-old boy and an 19-year-old man were arrested later in the evening.
The 17-year-old, of South Normanton, who cannot be named for legal reasons, has now been charged with grievous bodily harm and is due to appear at Chesterfield Youth Court on March 28.
The 19-year-old, of Chesterfield, has been released without charge.