Athenaeus (1854). “The Deipnosophists Or Banquet of the Learned of Athenaeus: With an Appendix of Poetical Fragments, Rendered Into English Verse by Various Authors and a General Index : in Three Volumes”, p.439
Attributed in Wash. Post, 18 Sept. 1898. According to the Oxford Dictionary of Quotations, this was "probably condensed from a long passage in E. A. de Las Cases Memorial de Ste-Helene (1823) vol. 4, 14 Nov. 1816; also attributed to Frederick the Great, in Notes and Queries 10 March 1866." The 1866 attribution to Frederick is worded "an army moves on (or by) its stomach."