The 1984-85 miners' strike was the longest and most bitter industrial dispute in British history. It began in March 1984 when the National Coal Board announced pit closures, and ended in March 1985 with the miners' total defeat. The strike was marked by violent clashes, particularly the Battle of Orgreave, and by divisions within the NUM over Arthur Scargill's refusal to hold a national ballot. Thatcher's government had prepared for the strike, stockpiling coal and ensuring police could prevent mass picketing. The miners lost, the pits closed, and entire communities were devastated. The strike marked the end of union power in Britain and the triumph of Thatcherism. It remains one of the defining events of the 1980s and a wound that has never fully healed.