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 Light Horse were recognised by friends and foes as the finest corps in the small splendid army of Hannibal.

Colonel A (the reader will learn why I give neither his name nor real rank) spoke with some bitterness of the inquisitiveness which rendered it impossible, he said, to trust an American with a secret, and very difficult to keep one without lying. We were presently joined by Major B, who had been employed during the war in the conduct of many critical communications, and had shown great ingenuity in devising and unravelling ciphers. On this subject a somewhat protracted discussion arose. I inclined to the doctrine of Poe, that no cipher can be devised which cannot be detected by an experienced hand; my friends indicated simple methods of defeating the processes on which decipherers rely.

"Poe's theory," said the Major, "depends upon the frequent recurrence of certain letters, syllables, and brief words in any given language; for instance, of es and ts, tion and ed, a, and, and the in English. Now it is perfectly easy to introduce abbreviations for each of the common short words and terminations, and equally easy to baffle the decipherer's reliance thereon by inserting meaningless symbols to separate the words; by employing two signs for a common letter, or so arranging your cipher that no one shall without extreme difficulty know which marks stand for single and which for several combined letters, where one letter ends and another begins."

After some debate. Colonel A wrote down and handed me two lines in a cipher whose character at once struck me as very remarkable.