sentences:  Working closely with Sir Basil Thomson, Director of Civil Intelligence in the British Home Office, with Colonel Hill Dillon, Chief of British Military Intelligence in Ireland, and with the local British Secret Service Head of Station, "Count Sevigné" at Dublin Castle, Ormonde Winter began to import dozens of professional secret service agents from all parts of the British Empire into Ireland to track down IRA operatives and Sinn Féin leaders.Treacy and Dan Breen were relocated to Dublin, where they were directed to operate with Michael Collins' assassination unit, "The Squad".The Squad's mission was to discover and assassinate British secret agents, political policemen and their informants, and to carry out other special missions for General Headquarters (GHQ) as directed by Collins.