The 3/4th Reserve Battalion was moved to Ebrington Barracks in Derry in April 1918. In April 1920, during the Anglo-Irish War, soldiers from the regiment fired into a protesting crowd on Bridge Street, leading to riots and skirmishes which saw it fight alongside the Royal Irish Constabulary (RIC) and (later) Ulster Volunteers (UVF) against the Irish Republican Army (IRA). Sporadic violence in the city continued until another large engagement in June, when the Dorsets and the UVF attacked the Bogside area of the city. A large IRA counter-offensive from the west ended the disturbances, which had seen 40 people killed since April. Some RIC officers threatened to resign over the Dorsets' fraternisation and co-operation with the UVF.