Note 4/20/17: Due to circumstances I have had to move my web pages here.


This is a web-based version of the "Division Field Code Training Edition No. 2". JPEG images of the pages in this book are available at for those I have tried for the most part to mimic the formatting of the original, although there are a few places where there are noticeable differences. One common situation is for longer phrases; the original would use smaller type and/or put the final word(s) at the end of the previous or next line, while I allow the phrase to wrap to the next line.

Using these Pages

When you are in the process of encoding a message, the top part of the page will look something like the following: (Note: In this example, only the navigation buttons are active, and the message is fixed).


YJIB6058Commanding officer s
CERS081691 st
ELPG1365Division s (of)
 (New group will be inserted before group selected by the radio button)

O Z U Z4144Disapproved
I H A M2325Do you
I V N U2663Displine ary
I D C M2227Does
K A Z U2949Discretion
L E K U3110– not
I S Z R2599Dispatch es (No. s)
O O F F3880Doing
L O P E3165Dispense ing s (with)
Y K E K6079Done
D O O H1014Dispensed (with)
E D S E1167Double ing s

The parts of the page have the following meanings:

Encoding a Message

The book includes an example of encoding messages on page 8-11. Here is my own example of encoding and decoding messages.

Suppose we want to send a message: "Do you have wireless connection with group HQ"

So our final message is:

Page Code Word Phrase
44 IHAM Do you
17 SUCD Null
49 DOHA Has (have)
63 XIEX Radio communication
75 HUVB With
49 POZL Group headquarters

So assembling the message as "Do you have radio communication with group headquarters" we could encode it as:

Note that if the message included proper names or other words not in the code, then there are two options:

Decoding a Message

Suppose we receive the message:

Take each of the code words, and look each word up in the decoding section of code book, finding:

Page Code Word Phrase
140 UREP Attack progressing
97 EIHJ Well
143 VIJD Stop (period)
93 DEFT Front line s
94 DOHA Has (have)
84 AFPF Reached
119 MITR North (of)
153 YWGF Null
97 EJHX Edge s (of)
124 OGVR Pas
152 YSVS S
108 IEBZ Y

So this message is "Attack making good progress. Front line has reached north edge of Passy."

Note that the code words are constructed so that valid groups differ by at least two letters. If a code word is incorrect and cannot be found in the decoding section, pages 12-16 describe procedures to fix the error and determine the correct code word.

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