The Mountbatten decided to do a series

The Article Dieppe- The secret purpose behind this disastrous Second World War raid from the Canada’s History magazine by David O’Keefe, explains the real purpose behind the Dieppe raid.
Many people believe that it was launched to test German defences and to gather information on German weapons. Little did they know, Dieppe was launched as a “pinch” operation. An operation made to capture cryptographic materials for code breakers.Before Dieppe there were many raids made to capture the highly sensitive material. The British were successful and broke into the three-rotor Enigma machines, because of this on February 1 1942 the German s introduced the four-rotor Enigma device.
To the Allies the bletchley Park operation was important to the protection of the sea. To b able to crack this device would give the Allies information about the Germans like their tactics, their weapons, their goals, and what they fear.
The British Royal Navy along with Combined Operations Headquarters put together a doctrine to capture enemy cipher material.
While the Allies were planning for their operation, Admiral Karl Doenitz started putting new four-rotor versions of the Enigma in the Atlantic U-boats making the operation harder for the Allies. This made Lord Louis Mountbatten, head of the Allied forces, hesitant to take and action so that he wouldn’t trigger Doenitz to start using the device.
Later on, Mountbatten decided to do a series of raids on the French coast knowing that Doenitz will eventually use the device. He decided the first two attacks were planned attacks on U-boats at Saint Nazaire in late March and Dieppe would be third in mid June.
The two attacks on the German U-boats coated the entire commando unit and failed to capture the needed cipher material. This made Dieppe look bigger and bolder making the Allies rely on this operation.
After being delayed twice the raid was finally launched on August 19 1942. Losing the vital element of surprise the Allies lost the Battle of Dieppe and less than half of the troops returned home. Even though the operations failed, the Allies did get their hands on the Enigma machine from a sinking German U-boat on October 30 1942.
Although they did lose a lot of their men “the risk of putting on a pinch raid was well worth taking but a less deadly way of pulling it off could have been possible.