TONY SALE: Rejewski had a flash of inspiration and he thought,
 what about if they've been stupid enough to just use ABCD
 as the order round the rotor, and they had, all the multitude
 of millions and millions of ways in which they could have scrambled
 the connection from the keyboard to the entry point, and they'd just
 chosen ABCD. And Marian Rejewski in desperation tried that, it worked,
 and suddenly he'd got the internal connections
 of the whole of the German forces machine.

"GC&CS already had a few intercepts and at least one plain text / ciphertext pair,
 reputed to have been smuggled to England by a Polish cipher clerk."

"The early Naval machine was soon worked out because the Poles
 had purchased a commercial version."