 One American general was sent back to the United States in disgrace after revealing the invasion date at a party.The Germans thought they had an extensive network of spies operating in the UK, but in fact all their agents had been captured, and some had become double agents working for the Allies as part of the Double-Cross System.The double agent Juan Pujol García, a Spanish opponent of the Nazis known by the code name "Garbo", developed over the two years leading up to D-Day a fake network of informants that the Germans believed were collecting intelligence on their behalf.