For the Mongols, the troops were more spread out, and even the officers were illiterate. All communication at every level had to be oral, not written. Orders moved by word of mouth from man to man. The problem with an oral system of communication lay in the accuracy of the message; the message had to be repeated precisely each time to each person and then remembered exactly as spoken. To ensure accurate memorization, the officers composed their orders in rhyme, using a standardized system known to every soldier.
