A man received a serious neck injury after allegedly being struck with a glass bottle.
The incident happened at a camp site, in Church Street, in Matlock on Sunday just after midnight.
A 22-year-old man from Sheffield received a four inch cut to his neck which needed 20-30 stitches.
A 27-year-old man from Stoke has been arrested on suspicion of wounding with intent.
He has been bailed pending further inquiries.