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This is when they initially started to decipher code.
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In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a shift of 3, A would be replaced by D, B would become E, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
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Samuel F. B. Morse made the electrical telegraph system.
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They made a chart and basically just guessed the code. They used most used words and letters in the English(American) language to crack it: Example:
