History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
In short all orders required pass in the same way and quickly reach the troops; as almost the whole Lacedaemonian army, save for a small part, consists of officers under officers, and the care of what is to be done falls upon many.