TheCodeBreakers
traffic for its solution than a one-part code, and the identifications came
more slowly and with greater difficulty. It had been in service on the
Continent for only half a year—not a very long time for a diplomatic
code—and portions of many messages remained unreadable.
As more traffic came in (including now the messages to and from
Bernstorff), Montgomery and de Grey, working night and day, filled in
more and more groups, ever more rapidly. On January 28, de Grey
brought Hall part of Bernstorffs protest against Zimmermann's plan of
unrestricted submarine warfare, which, to the ambassador's dismay, had
been announced to him in message No. 157, the first part of the double-
decker. Bernstorff argued vigorously against this plan, for he felt that it
negated all his efforts to bring about a detente between the two countries
and that it would drive the United States into the war on the side of the
Allies.
And in fact, on February 3 Wilson announced to Congress that he was
annaabi.ee 
