Statistics for occurrence #1 of “European” in chapter 10 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.:

...f of staff of an army is usually selected from the grade next below that of the general commanding, and receives the title, for the time being, which is used to designate this special rank. In some European armies, and formerly in our own service, this officer was called major-general. In France, if the generalissimo commands in person, a marshal is made chief of staff with the temporay title of major...
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