During the Troubles, the period of civil conflict centred on Northern Ireland from 1969 to 1998, the Defence Forces deployed to aid the Garda Síochána. Troops were deployed for duty to the border areas, new border military posts were established, and in 1973 new permanent border units were established. In 1974, troops were deployed to maximum-security prisons in Portlaoise and Limerick where IRA prisoners were detained. Armed troops were deployed in 1976 to all major post offices during a three-month national bank strike. In 1978, cash-in-transit escorts were established to protect large cash movements throughout the state, continuing until 2014. Tasks in military aid to the civil power continue today, but no longer to the same degree or intensity.