Our Centenary Series continues with Elizabeth Stack, PhD, with an in-depth look at the events of April to August 1922. Fighting did not officially break out until June, but there had been skirmishes since February, culminating in the failed election pact between Michael Collins and Eamon de Valera. However, it is the assassination in London of Henry Hughes Wilson by IRA men in retaliation for attacks on Catholics in Northern Ireland - ironically ordered by Michael Collins - which brings the threat of Great Britain re-involving itself in Irish affairs, which leads to the Four Courts being shelled by the Free State forces.