Operation Bernhard was the codename of a secret Nazi plan devised during the Second World War by the RSHA and the SS to destabilise the British economy via economic warfare by flooding the global economy and the British Empire with forged Bank of England £5, £10, £20, and £50 notes. It was the largest counterfeiting operation in the history of economic warfare, and the first that employed the full technical/scientific and management expertise of a sovereign state to produce and deploy bogus currency with the aim of destabilising an enemy belligerent’s economic standing with its allies, as well as its acceptance by neutral powers.