Castanier had the southern temperament; he had joined the army as a lad of sixteen, and had followed the French flag till he was nearly forty years old. As a common trooper, he had fought day and night, and day after day, and, as in duty bound, had thought of his horse first, and of himself afterwards. While he served his military apprenticeship, therefore, he had but little leisure in which to reflect on the destiny of man, and when he became an officer he had his men to think of. He had been swept from battlefield to battlefield, but he had never thought of what comes after death. A soldier's life does not demand much thinking. Those who cannot understand the lofty political ends involved and the interests of nation and nation; who cannot grasp political schemes as well as plans of campaign and combine the science of the tactician with that of the administrator, are bound to live in a state of ignorance; the most boorish peasant in the most backward district in France is scarcely in a worse case. Such men as these bear the brunt of war, yield passive obedience to the brain that directs them, and strike down the men opposed to them as the woodcutter fells timber in the forest. Violent physical exertion is succeeded by times of inertia, when they repair the waste. They fight and drink, fight and eat, fight and sleep, that they may the better deal hard blows; the powers of the mind are not greatly exercised in this turbulent round of existence, and the character is as simple as heretofore.
When the men who have shown such energy on the battlefield return to ordinary civilization, most of those who have not risen to high rank seem to have acquired no ideas, and to have no aptitude, no capacity, for grasping new ideas. To the utter amazement of a younger generation, those who made our armies so glorious and so terrible are as simple as children, and as slow-witted as a clerk at his worst, and the captain of a thundering squadron is scarcely fit to keep a merchant's day-book. Old soldiers of this stamp, therefore, being innocent of any attempt to use their reasoning faculties, act upon their strongest impulses. Castanier's crime was one of those matters that raise so many questions, that, in order to debate about it, a moralist might call for its "discussion by clauses," to make use of a parliamentary expression.