In August of 1910, owners posted a lock-out notice at the mine. The miners went on strike. The owners then called in replacement workers. The miners responded by picketing the work site. They were joined by thousands of others who successfully acted to shut down all the local pits except one Llwynypia colliery. Rioting occurred, and Glamorgan's chief constable requested military support from then British Home Secretary Winston Churchill.
Although no authentic record exists of casualties, as many of the miners would have refused treatment in fear of being prosecuted for their part in the riots, nearly 80 policemen were injured and over 500 other people. Samuel Rhys, a miner who sustained head injuries, said to have been inflicted by a policeman's baton, later died of his injuries. Thirteen miners from Gilfach Goch were arrested and prosecuted for their part in the unrest and the authorities transformed Tonypandy into a near military camp. They had reinforced the town with 400 policemen, two troops of infantry and a squadron of the 18th Hussars.
Purported eyewitness accounts of alleged shootings persisted and were relayed by word of mouth. In the autobiographical 'documentary novel' Cwmardy, a contemporary communist trade union organiser Lewis Jones presents a stylistically romantic but closely detailed account of the riots and their agonising domestic and social consequences. In a chapter Soldiers are sent to the Valley, he narrates an incident in which eleven strikers are killed by two volleys of rifle fire in the town square, after which the miners adopt a grimly retaliatory stance. In this account, the end of the strike is hastened by organised terror directed at mine managers, leading to introduction of a minimum-wage act by the government—hailed as a victory by the strikers.
A more official version states that "The strike finally ended in August 1911, with the workers forced to accept the £2.1s.3d [minimum weekly wage] negotiated by William Abraham MP prior to the strike . . . the workers actually returning to work on the first Monday in September, being ten months after the strike began and twelve months after the lock-out which started the confrontation. Minimum-wage legislation was in fact enacted by the Asquith government in mid-March, 1912, to resolve a national coalminers' strike and threats of a general strike.