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You now know what sort of a pupil I (like the trainer) insist upon, He must not be weak either at understanding or at making himself understood, but a man of penetration, a capable administrator—potentially, that is,—with a soldierly spirit (which does not however exclude the civil spirit), and some military experience; at the least he must have been in camp, seen troops drilled or manceuvred, know a little about weapons and military engines, the differences between line and column, cavalry and infantry tactics (with the reasons for them), frontal and flank attacks; in a word, none of your armchair strategists relying wholly on hearsay.