TheCodeBreakers
except for the addition of a single element to the internal address of the
DTD message. He had only to seek an arrangement of columns that would
produce such a pair of cryptograms. Within an hour he had found it:
6 16 7 5 17 2 14 10 15 9 13 1 21 12 4 8 19 3 11 20 18 The solution of
the checkerboard followed quickly:
c
m
n j
5
P
e
The DAX plaintext read: 14 ID XX Gen Kdo ersucht vordere Linie sofort
drahten XX Gen Kdo 7 ("14th Infantry Division: HQ requests front line
[situation] by telegram. HQ 7th [Corps]"). The DTD text was identical
except for its being addressed 216 ID.
Painvin completed his solution at 7 p.m. on June 2, and sent it at
once to G.H.Q. By then the French had managed to halt Ludendorff's
push, but they teetered precariously on the brink of defeat. The Germans
were shelling Paris from 60 miles away with their long-range guns. The
annaabi.ee 
