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In the small hours of Monday March 12 1984, hundreds of Yorkshire miners moved across the border from Yorkshire into Nottinghamshire. Their destination was Harworth pit, and by the evening shift they had picketed it out.
Over the next few days, hundreds of Yorkshire pickets came down over the border again and spread out across the Notts coalfield. Their mission was to persuade Nottinghamshire's miners to join them in a strike to stop the pit closures announced by the National Coal Board chief, Ian MacGregor. Their tactic was to picket Notts to a standstill