A man must appear somewhat vain, who declares that he has been obliged to reject much useful information, for fear of increasing too much the size of his work: and yet manages to find room for a few pages of his own, by way of Preface: but lest the objects which the compiler of this little work has had in view should be mistaken, he finds it absolutely necessary to say a few words in explanation of them. This small collection of military memorandums was originally intended only for the compiler’s own pocket; to assist him in the execution of his duty: but it occurred to him, that many of his military friends stood in equal need of such an aid, and would willingly give a few shillings for what they would not be at the trouble of collecting. The compiler has seen young men, on their first entry into the regiment of artillery, give a guinea for manuscripts, which contained a very small part of the information offered in this little book. From a persuasion that a very principal part of its merit is derived from its portability, every endeavor has been used to press much into a little compass; and it is hoped, that this power has not been so far exerted, as to make the whole unintelligible: but, it must be understood, that the compiler does not propose to convey instruction to the untaught, but only to make a few memorandums of reference to facts; which those already versed in the military profession are supposed to have the knowledge to apply. The totally ignorant of these matters, he has, therefore, nothing to say to; they must consult more voluminous works. An alphabetical arrangement is merely adopted as the best calculated for this purpose; and as nothing like a military dictionary is intended, all terms are omitted, not within the compiler’s plan. All reference to plates has, likewise been avoided; as they not only very much increase the cost, but the bulk of a book. The principal difficulty which the compiler has had in making this little collection, has been to confine it within the limits of his original plan. The quantity of useful information which has pressed for admittance, has been with reluctance rejected. Such authors only have been quoted, as are generally esteemed the best; and every advantage has been taken of such information, as the compiler has been able to collect from experienced friends; but he has ventured to offer nothing whatever of his own. The French military authors have been principally consulted, on all subjects not immediately confined to our own system; and such notes as are given respecting their ordnance, may be of use in drawing a comparison with our own; and may serve as references to those in the habit of reading their military works. The compiler has not, in any instance, attempted to offer changes which he may have been led to imagine improvements; or to point out what he thinks deserve the title of defects in our own system; but he has given every information according to the present practice in our service. He cannot, however, help expressing a hope, that he will one day see his little book laid by as totally obsolete, and a better built upon a system less complicated, and more applicable to that particular nature of service which this country has in every war the greatest reason to expect.