The following is from Heinlein's Starship Troopers (1959):
Youse guys think this deleted outfit is a blankety-blank nursery. Well, it ain't! See?
—Remark attributed to a Hellenic corporal before the walls of Troy, 1194 B.C.
Considering the veracity of other quotes in the book, I suspect that the above quote is paraphrased from a historical source. Can anybody identify the original?