Notions most mistaken prevail in regard to the Pawns and Pieces of the Chessboard. To suppose that the Chessmen _per se_ may be utilized to typify the different arms of the military service is a fallacy. Many unfamiliar with the technicalities of Strategetic Science delude themselves that the Pawns, on account of their slow and limited movements properly are to be regarded as Infantry; that the Knights because topped by horses’ heads thereby qualify as light Cavalry; the Bishops, for reasons unknown, often are held to represent Artillery; the Rooks, because of their swift, direct and far-reaching movements are thought to duplicate heavy Cavalry; while the Queen, in most of these unsophisticated philosophies, is supposed to constitute a Reserve. Nothing can be further from the truth than such assumptions. As a fundamental of military organization applied to Chessplay, each Chesspiece typifies in itself a complete Corps d’armee. Each of these Chessic corps d’armee is equal to every other in strength, but all differ, more or less, in construction and in facilities, essential to the performance of diverse and particular duties. Thus it is that while every Chesspiece represents a perfectly appointed and equally powerful body of troops, these corps d’armee in Chessplay as in scientific warfare are not duplicates, except to others of their own class. Each of these corps d’armee is made up of Infantry, Cavalry and Artillery in correct proportion to the service they are to perform and such proportions are determined not by simple arithmetic, but by those deployments, developments, evolutions, and manoeuvres, which such corps d’armee is constructed promptly and efficiently to execute. The Chessmen, therefore, do not as individuals represent either infantry, cavalry or artillery. But in the same manner as the movements of troops over the surface of the earth, exemplify the attributes of the three kindred grand columns in the greater logistics of a campaign; so do those peculiarities which appertain to the moves of the different Chesspieces exemplify the action of the three chief arms of the military service; either singly or in combination against given points in given times, in the evolutions of the battlefield, viz.: CORPS D’ARMEE EN MARCH. The march of: (_a_) Infantry, alone, or of (_b_) Cavalry, alone, or of (_c_) Artillery, alone, or of (_d_) Infantry and Cavalry, or of (_e_) Infantry and Artillery, or of (_f_) Cavalry and Artillery, or of (_g_) Infantry, Cavalry and Artillery, is indicated by the movement of any Chesspiece from a given point to an unoccupied adjacent point. The march of: (_a_) Cavalry, alone, or of (_b_) Artillery, alone, or of (_c_) Cavalry and Artillery, is indicated by the movement of any Chesspiece from a given point to an unoccupied point, _not_ an adjacent point. CORPS D’ARMEE EN ASSAULT.