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.
Meanwhile they would take only half the ships across the Isthmus first, and let those sail off at once, in order that the Athenians might attend less to the departing squadron than to those to be taken across afterwards,