Cryptanalysis of the Enigma immense problem and it gave a great deal of trouble. Work on a high speed machine had been started by Wynn-Williams of the TRE late in 1941 and some nine months later Harold Keen of BTM started work independently. Early in 1942, Bletchley Park were a long way from possessing a high speed machine of any sort. Eventually, after a long period of being unable to decipher U-boat messages, a source of cribs was found. This was the Kurzsignale (short signals), a code which the German navy used to minimize the duration of transmissions, thereby reducing the risk of being
The Kingdom of the Netherlands During World War II a negative conclusion, according to critics). De Jong's work is regarded as the most important Dutch publication on World War II, and in the series he uncovered hitherto unpublicized events from the war, such as the death by firing squad of Dutch deserter , executed for desertion on 12 May 1940 after a quick court-martial—he was the only Dutch soldier to be executed by the Dutch in the twentieth century. De Jong's work supported and contributed to a vision of the Dutch during the war that has come increasingly under fire. The general idea presented in "The Kingdom of the