Before he left England he had been sent on a special course for spies operating in enemy hands. He was told that he would be of more use as a POW than as a combat soldier. He was captured at Dunkirk on 29 May 1940 and remained a prisoner of war until 1945. He volunteered to serve at the BlechhammerPOW camp in Upper Silesia, and the fact that he had been a member of the British Union of Fascists before the war helped him ingratiate himself with the Germans and strike up a relationship with the camp commandant. In the summer of 1942 a special camp was established to separate potential collaborators from other British POWs, Stalag III-D near Berlin. This in turn was divided into Special Detachment 999 and Special Detachment 517. Both were presented by the Germans as "holiday camps" away from the poor rations, hard work and cold of normal camps, but the camp security was run by the Abwehr. Brown was one of the prisoners sent to Freigegeben Stalag III-D for an initial examination. A former member of the British Union of Fascists, he had developed a good relationship with the Germans, which he exploited to run a very efficient blackmarket operation among the conscripted foreign workers, using some of the profits to buy "luxury" items such as extra food, medicine for the camp hospital and even musical instruments for the camp band. Brown also had a hidden radio so was aware of the course of the war. At Stalag III-D Brown quickly realised something was wrong, and after his visit he returned to Blechhammer. There he had met Captain Julius Green, a Jewish-Glaswegian officer who was the camp's dentist. Green gave Brown the codes and the means to pass intelligence back to London through MI9's Escape and Evasion Network. Brown decided to return to Stalag III-D as soon as possible; not only were the conditions better, he was suspicious of what the Germans were planning. After a carefully orchestrated row with the senior British NCOs at Blechhammer he persuaded the Commandant, Rittmeister Prinz Von Hohenlohe, to transfer him back to Stalag III-D. He arrived on 12 June 1943 where he was selected by Major Heimpel of the Gestapo to be senior British NCO of Special Detachment 517 based at Genshagen, in the Teltow-Fläming district of Berlin. Throughout all this time, while being distrusted by the British P.O.W.s, he was reporting to MI6 by coded letters, giving guidance on targets for bomber attacks. More particularly he was engaged in subverting the German proposal to form a British Free Corps to fight for Germany. His cohorts included opera singerMargery Booth, a fellow British spy, who on one occasion whilst entertaining the camp inmates sang before Hitler just after Brown had hidden secret documents in her dress; Hitler subsequently sent her red roses wrapped in a Swastika flag. Brown was instrumental in identifying the British traitorJohn Amery, and both Brown and Booth had contact with William Joyce, and were recruited by Joyce as a broadcaster on the German Concordia radio service; both later identified him post war, and were witnesses at his trial. At one point Brown was confronted by Major Heimpel with a statement from a traitor giving details of Brown's espionage activities, but Brown blamed it on some of the Jewish inmates, saying they were out to destroy the idea of a British Free Corps. The Germans believed him, but Heimpel still believed that he was a secret agent, and when the British Free Corps were disbanded Himmler ordered Brown's arrest. As the Allied forces entered Germany, Brown and a friend managed to kill an SS Colonel, steal his car and make contact with US Army forces. However, once back with British forces he found himself facing a charge of aiding the enemy. Word of his secret work for the Allies soon came from London, and he was awarded the Distinguished Conduct Medal in recognition of his achievements. After the war he was the chief prosecution witness at 20 treason trials.
Later life
He wrote of his wartime exploits in a book, In Durance Vile, concluding "...I was only able to do what I did because of my Christian belief which sustained me in my durance vile through not only the danger, but the hopeless dreariness of prisoner-of-war life". Brown's story is recounted from the perspective of Reg Beattie, one of the members of his team, in the book about Reg's POW diary entitled "Captive Plans". After working as a businessman in Newcastle, he moved to Dorset, where he died in 1964.
