HistoryExtra podcast Spy, hero, rebel, traitor: the story of Roger Casement
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Mar 27, 2026 
Rory Carroll, Guardian staff correspondent and author, offers a concise mini bio as an expert on Roger Casement and Irish history. He traces Casement’s shift from humanitarian diplomat to militant ally of Germany. Short, sharp scenes cover the failed POW brigade plan, secret arms runs, the infamous diaries, British intelligence efforts, and Casement’s contested legacy.
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Casement's Failed POW Recruitment In Germany
- Casement travelled to Germany to secure weapons and to recruit an Irish brigade from POWs but failed to persuade most captured Irish soldiers.
- Carroll recounts Casement's poor fit with squaddies in prison camps and that only a few dozen agreed to join.
Private Diaries Became Public Liability
- Casement secretly kept explicit diaries documenting homosexual encounters, a vulnerability when homosexuality was criminalised.
- Carroll notes Casement habitually left journals scattered, which later endangered him politically when in enemy hands.
Blinker Hall's Intelligence Machine
- Captain Reginald 'Blinker' Hall transformed Admiralty intelligence into a mass-surveillance and codebreaking operation tracking Casement.
- Rory Carroll describes Hall intercepting mail, decoding messages, and focusing resources to pursue Casement specifically.