It is known as the bloodiest battle of the 1984-5 Miners' Strike.
On the 18th of June, thousands of pickets clashed with police at Orgreave in Yorkshire. Hundreds of miners and police were left seriously injured.
More than 90 miners were arrested. Some were charged with rioting and could have faced life imprisonment. But the trial collapsed after claims that police evidence had been fabricated.
Tonight on Wales This Week, we speak to miners on the picket line who remember the battle of Orgreave 30 years on.
Two Welsh miners, Phil James and Harry Selwood were arrested at Orgreave. Both were charged with causing a riot and faced going to jail. They say the miners took a lot of the blame for the rioting.
The strike had started peacefully with some of the pickets playing football but as more miners arrived tensions began rising. Harry Selwood remembers being guided to Orgreave by the police.
The police have denied setting up a trap for the miners. Assembly Member, Mick Antoniw, was a solicitor during the 1980s and a member of the team who successfully defended the miners in court.
After the case collapsed, the prosecution dropped the charges against all 93 miners. The defence team called for there to be a public inquiry. The request was ignored.
ITV Wales has spoken to a number of policemen from Wales who were there on the day. All denied that they tampered or faked the evidence. But a number of them claimed that some officers from certain other forces had been heavy handed.
In November 2012, after more claims of police falsifying witness statements, the South Yorkshire Police Force referred itself to the Independent Police Complaints Commission. The Police Force declined an interview but said they would, as usual, fully co-operate with the commission's inquiry.
18 months on, the IPCC is still considering whether to investigate possible criminal behaviour by police officers.
The IPCC commissioner overseeing the inquiry, Cindy Butts, says she appreciated the concerns about the time it was taking but that it was a very complex process.
To watch the full programme tune into Wales This Week on ITV Cymru Wales tonight at 8pm.