Statistics for occurrence #1 of “Mexican” in chapter 7 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.:

...d navigable rivers, which expose our most populous cities to maritime attacks. The northern land frontier is two thousand miles in extent, and in the west our territory borders upon the British and Mexican possessions for many thousand miles more. Within these limits there are numerous tribes of Indians, who require the watchful care of armed forces to keep them at peace among themselves as well as w...
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