Statistics for occurrence #1 of “Mississippi rivers” in chapter 4 of H. Wager Halleck , A. M. , Lieut. of Engineers, U. S. Army ., Elements of Military Art and Science; or, Course of Instruction in Strategy, Fortification, Tactis of Battles &c., Embracing the Duties of Staff, Infantry, Cavalry, Artillery and Engineers. Adapted to the Use of Volunteers and Militia.:

...tifications on the sea-coast, and substitute in their place wooden Martello towers! This would be very much like building 120 gun ships at Pittsburg and Memphis, for the defence of the Ohio and the Mississippi rivers , and sending out duck-boats to meet the enemy on the Atlantic! In the second system, the works on the extreme frontier are to be placed about thirty or forty miles apart, and those of the second ...
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