Daly and the men under his command were responsible for the killing of many British intelligence officers, in particular District Inspector Redmond, who had been putting increasing pressure on the squad. Daly himself personally killed several people, including Frank Brooke, director of Great Southern and Eastern Railway, who served on an advisory council to the British military, in June 1920. He did not directly lead any of the attacks on Bloody Sunday but was on standby in one of the Squad's safe houses. In the aftermath, 23 November 1920, he was arrested and interned in Ballykinlar Camp in County Down.