Two men are driven to a quiet country lane close to Dundalk near the Irish border. Cars are used to block off access to the lane, less than ten other people are present.

They watch silently, as the two men walk to a clear area, strip to the waist and prepare for a bare-knuckle fistfight.

The rules are no biting, head-butting or below the belt punches. There are no rounds or breaks and the fight goes on until one man gives up or is knocked out.

James Quinn McDonagh and Paddy ‘The Lurcher’ Joyce are there to represent their feuding Traveller clans.

Although the Quinn McDonaghs and the Joyces are cousins, they are bitter enemies and have clashed for generations. The two families are at the heart of one of the longest and most violent bare-knuckle boxing feuds in Ireland and England.

Knuckle takes us into this secretive Traveller world – a world of long and bitter memories and a history of violent clashes between rival clans, which has sometimes resulted in death.

Knuckle is out in cinemas today. Take a look at some clips from the movie: