The Munchen was found and taken on 7 May 1941 and it was with the settings thus obtained that they became able to read the June traffic 'practically currently'.
At last, they had a command of the day to day tactics.
The July settings were captured from another of the weather-reporting trawlers, the Lauenburg, on 28 June.
Meanwhile on 9 May, an accidental, but brilliantly conducted operation had taken place.
A convoy escort detected and disabled the U-110 which had attacked the convoy.
In a split-second manoeuvre on the high seas, they boarded the U-boat and took intact its cipher material.
The lessons of 1940 had been learnt.
The material filled some outstanding gaps, for it included 'the code-book used by the U-boats when making short-signal sighting reports', and 'the special settings used in the Navy for "officer-only” signals'.
These Offizierte signals were doubly enciphered for extra security within the U-boat itself.
From the Hut 8 point of view, these were signals which, even after the day's settings had been found and the decryption process applied, remained gibberish while the other messages became German.
It required a second stage of attack to recover these, the innermost secrets of the U-boat operations.
Now they had what they needed to do it.