In recent years, the bombing of Guernica on 26 April 1937 has been increasingly interpreted in the context of the development of aerial warfare in the inter-war period. The special relationship between the "novel" way of conducting war in and from the air and the perception of this type of warfare is emphasised. As a result of the bombing of entire cities and the use of machine guns from low-flying aircraft, a new type of warfare emerged, in which the differences between civilian and military populations began to blur. The German-Italian bombing of Guernica will be framed as an essential link in this process, which would reach its first peak in the Second World War.