The Welsh coal strike of 1898 was an industrial dispute involving the colliers of South Wales and Monmouthshire. The strike began as an attempt by the colliers to remove the sliding scale, which determined their wage based on the price of coal. The strike quickly turned into a disastrous lockout which would last for six months and result in a failure for the colliers as the sliding scale stayed in place.[1] The strike is seen as an important landmark in Welsh history as it saw the true adoption of trade unionism in the southern coalfield which had been slow to take hold before then. The South Wales Miners' Federation was the largest trade union to have originated from this dispute.