American interrogators attached to XVIII Airborne Corps discovered the plot and reported it to British authorities, with two members subsequently awarded the bronze star medal for their roles in the investigation.

Prisoners suspected of involvement were sent to the London Cage for further interrogation by Colonel Alexander Scotland and afterwards to the maximum-security Cultybraggan Camp in Comrie.

[1][2] However a 1996 account by military historian Roderick De Normann names the prisoners Obergefreiter Wunderlich and Korporal Hermann Storch as the main conspirators.

[3] Normann was only able to find official documents referencing Koenig upon his involvement in the lynching of Feldwebel Wolfgang Rosterg at Cultybraggan camp.

[1] It was estimated that 7,000 PoWs could escape from Le Marchant, who would proceed to seize[6] RAF Yatesbury and gain access to equipment including aircraft and armoured vehicles.

[7] The ultimate goal of the plot was to reach the eastern coast of Britain, around East Anglia, attacking military installations including a tank depot in the process.

One account states the Americans Frank Brandstetter and Joseph Hoelz overheard a prisoner say that "the arms store was the key."

[2] Another account detailed by De Normann claims that Korporal Storch revealed the plot upon interrogation by another American officer, Lieutenant Vogeli, after being accused of instigating a separate escape attempt on 19 November.

[18] Prisoners involved in the Devizes plot incorrectly believed Rosterg had informed the British of their plans and that he had been sent to Cultybraggan to continue spying on them.

[1] Their suspicions were further raised after he asked for a copy of "die Wochenpost", a PoW newspaper produced by the foreign office which was widely regarded by other prisoners as British propaganda.

[23] Medical witnesses later testified that Rosterg's wounds from his beating were insufficient to cause death, and he had likely died to strangulation prior to being hanged in the toilets.

[1] Prosecutors argued that this did not give them the right to murder Rosterg, additionally it was observed that the defendants appeared to be bored or otherwise disinterested at points in the trial.