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The paper records the part played by the Telecommunications Research Establisment (TRE) in the development of the art and technique of radio countermeasures, and to crystallise the experience gained during the Second World War. It does not attempt to deal comprehensively with the whole story, as the contribution of the TRE was only a small part of the whole. The paper describes the use of radio countermeasures, first as a defence against enemy bomber attacks and later in support of our offensive operations. Sections describing the technique and the applications to the final phase of the Second World War have been omitted but are included in the copy deposited in the IEE Archives.