Our Government evidently knows when and where to lay its finger upon its most available citizens; for, quite unexpectedly, we were joined by some other gentlemen, scarcely less competent than ourselves, in a commission to proceed to Fortress Monroe and examine into things in general. Of course, official propriety compels us to be extremely guarded in our description of the interesting objects which this expedition opened to our view. There can be no harm, however, in stating that we were received by the commander of the fortress with a kind of acid good-nature, or mild cynicism, that indicated him to be a humorist, characterized by certain rather pungent peculiarities, yet of no unamiable cast. He is a small, thin, old gentleman, set off by a large pair of brilliant epaulets,--the only pair, so far as my observation went, that adorn the shoulders of any officer in the Union army. Either for our inspection, or because the matter had already been arranged, he drew out a regiment of Zouaves that formed the principal part of his garrison, and appeared at their head, sitting on horseback with rigid perpendicularity, and affording us a vivid idea of the disciplinarian of Baron Steuben’s school. There can be no question of the General’s military qualities; he must have been especially useful in converting raw recruits into trained and efficient soldiers. But valor and martial skill are of so evanescent a character (hardly less fleeting than a woman’s beauty), that Government has perhaps taken the safer course in assigning to this gallant officer, though distinguished in former wars, no more active duty than the guardianship of an apparently impregnable fortress. The ideas of military men solidify and fossilize so fast, while military science makes such rapid advances, that even here there might be a difficulty. An active, diversified, and therefore a youthful, ingenuity is required by the quick exigencies of this singular war. Fortress Monroe, for example, in spite of the massive solidity of its ramparts, its broad and deep moat, and all the contrivances of defence that were known at the not very remote epoch of its construction, is now pronounced absolutely incapable of resisting the novel modes of assault which may be brought to bear upon it. It can only be the flexible talent of a young man that will evolve a new efficiency out of its obsolete strength.