Although later overshadowed by the IRA's Border Campaign (1956–1962) incidents such as Saor Uladh's attack on the RUC barracks in Rosslea, County Fermanagh, in which IRA member Connie Green was killed, contributed to the fall of the Government and the 1957 general election. Costello's Government, although it decided against the re-introduction of internment, responded to the activities of Saor Uladh and the mainstream IRA by stepping up security measures against these groups, leading to the arrest of prominent republicans. In response to this and to a deterioration in the state of the economy, Clann na Poblachta withdrew its support and Costello was left with no choice other than to call an election.