Coal miners in South Wales staged a major strike in 1910-1911 over wages and working conditions, culminating in violent confrontations with police and the deployment of military forces. The strike began as a dispute over payment rates for working a difficult coal seam at the Ely Pit in Penygraig but escalated into one of the most significant labour conflicts in Welsh history.
The strike formed part of the broader Great Unrest period (1910-1914), during which Britain experienced over 4,000 strikes involving approximately four million workers. This unprecedented wave of industrial militancy saw trade union membership grow by 62 per cent from 2.5 million in 1910 to 4.1 million in 1914, with workplace density increasing from 14.6 per cent to 23 per cent.