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Dieppe was a seaside resort in Normandy, built along a long cliff that overlooked the Channel.
The Dieppe fiasco demonstrated that it was imperative to improve communications at all levels: on the battlefield, between the HQs of each unit, between air, naval and ground forces.
In addition, the raid on Dieppe showed how important it was to use prior air bombings to destroy enemy defences as much as possible, to support assault troops with artillery fire from ships and landing crafts, to improve techniques and equipment to remove obstacles to men and tanks.
Dieppe was not thought to be heavily defended and it was considered that, with tank support in the front line, this force would be sufficient to accomplish the raid's objectives.
After the Dieppe raid Allied planners were forced to review their previously held supposition that the capture of a significant port was an essential precursor to an invasion of mainland Europe.
Dieppe1942 - The Jubilee Disaster by Ronald Atkin.