Following the surrender, Collins was arrested and taken into British custody. He was processed at Dublin's Richmond Barracks by "G-Men", plain-clothes officers from Dublin Metropolitan Police. During his screening, Collins was identified as someone who should be selected for further interrogation, harsher treatment, or execution. However, he overheard his name being called out so he moved to the other side of the building to identify the speaker. In doing so, he joined the group that was transferred to Frongoch internment camp in Wales, a movement that historian Tim Pat Coogan describes as "one of the luckiest escapes of his life."