This is clearly the word REINFORCEMENTS and, using the letters thus found, the rest of the line becomes AMMUNITIONAND. We have then the following letters determined:
| Arbitrary letters | A | B | C | D | E | F | G | H | I | J | K | L | M |
| Plain Text | R | E | I | N | F | O | C | M | T | S | A | U | D |
If these be substituted we have for the message:
REINFORCEMENTS AMMUNITION AND RATIONS MUST ARRI_E _EFORE T_E FIFTEENT_ OR _E CANNOT _O_D OUT_.
From this the remainder of the letters are determined:
| Arbitrary letters | N | O | P | Q | R | S |
| Plain text | V | B | H | W | L | X |
Now let us substitute the two-letter groups for the arbitrary letters:
| Arbitrary letters | K | O | G | M | B | E | P | C | R | H | D | F | A | J | I | L | N | Q | S |
| Two-letter groups | GG | RG | AG | NG | TG | GR | AR | NR | GA | RA | AA | NA | RN | AN | NN | TN | GT | RT | AT |
| Plain text | A | B | C | D | E | F | H | I | L | M | N | O | R | S | T | U | V | W | X |
It is evident that the cipher was prepared with the letters of the word GRANT chosen by means of a square of this kind: