Fifteen men and one woman have been jailed after admitting their part in a mass brawl at a boxing event in Leeds.
The fighting erupted at Elland Road stadium and "took over the whole venue", Leeds Crown Court heard.
Security staff were unable to stop the brawling between rival groups from Leeds and Wakefield on 18 February.
One man even punched his own friend before apologising and shaking hands, and a woman was punched and knocked out.
The incident involved up to 50 people. Many who were caught on CCTV pleaded guilty to violent disorder.
Referring to "serious mob violence", Judge Geoffrey Marson QC said it was "a miracle someone was not seriously injured".
Footage of the 15-minute fight at the white collar boxing event held in the Centenary Pavilion at Leeds United's stadium shows chairs being hurled and a woman being knocked to the floor.
Philip Adams, prosecuting, said that before the event, for which about 700 tickets had been sold, there had been "an exchange of insults" on social media.
He added: "The boxers came from different towns and brought support on the night from Leeds and Wakefield.
"The organisers attempted to separate the two groups of supporters."
Following a minor incident between a boxer and a rival trainer a chair was thrown into the ring. Almost immediately widespread fighting broke out.
"The security guards were powerless to stop the fighting," said Mr Adams.
"Some of the women joined in the fighting. Others climbed into the ring with children to avoid it.
"Members of the security team did their best to usher people outside. Children and injured people were escorted to the cloakroom.
"Sporadic fighting continued outside until the police arrived."
Det Supt Lisa Atkinson, Head of Crime for the Leeds District, said: "What was witnessed that night were some really ugly scenes of violence and disorder on a large scale."
- Debbie Marie Brear, 30, of Snapethorpe Road, Wakefield: 11 months imprisonment
- Ashley Buss, 24, of Clark Mount, Richmond Hill: two years plus a further two years for a separate offence of GBH
- Nathan Conroy, 24, of Brooklands Avenue, Seacroft: 16 months
- Thomas Clifford Hall, 30, of Recreation Grove, Holbeck: 12 months
- Kayne Paul Regan, 21, of O'Grady Square, Cross Green: two years
- Jack Burgess, 20, of Montcalm Crescent, Hunslet: 18 months in a young offenders' institution
- Nathan Kenneth Reynolds, 28, of Walkers Lane, Leeds: 12 months
- Lewis Shenbanjo, 27, of Blue Hill Crescent, Wortley: two years
- Darren Leslie Fisher, 30, of Heald Street, Castleford: 23 months
- Declan James Storey, 23, of Charles Avenue, Leeds: 12 months
- Ricky Flint, 22, of Petersfield Avenue, Belle Isle, Leeds: 18 months
- Liam Mudd, 26, of Clough Court, Morley: 18 months plus a further 12 months for another offence
- Jonathan Djambe, 21, of Doncaster Road, Pontefract: six months
- Patrick Lock, 24, of HM Prison Wealstun: 12 months
- Martin Wormald, 34, of Brooklands Crescent, Seacroft: 14 months
- Andrew Rowse, 31, of Northcote Crescent, Beeston: 16 months
- Barry John Brattley, 30, of Pontefract Street, East End Park, did not attend court. A warrant was issued for his arrest.