The guerrilla phase of the war had been going since late 1650 and at the end of 1651, despite the defeat of the main Irish or Royalist forces, there were still estimated to be 30,000 men in arms against the Parliamentarians. Tories (from the Irish word "tóraí" meaning "pursuer" or "outlaw") operated from difficult terrain such as the Bog of Allen, the Wicklow Mountains and the drumlin country in the north midlands, and within months made the countryside extremely dangerous for all except large parties of Parliamentarian troops. Ireton mounted a punitive expedition to the Wicklow mountains in 1650 to try to put down the tories there, but without success.