The moral effect produced in war upon men's minds, and through the mind upon their actions, is undeniable, and may rightly count for much in the calculations of a commander; but when it becomes the sole, or even the chief reliance, as in Bonaparte's advance into Carinthia in 1797, the spirit displayed approaches closely to that of the gambler who counts upon a successful bluff to disconcert his opponent. The serious objection to relying upon moral effect alone to overcome resistance is that moral forces do not admit of as close knowledge and measurement as do material conditions. The insight and moral strength of the enemy may be greater than you have means of knowing, and to assume that they are less is to fall into the dangerous error of despising your enemy. To attribute to so dubious a hope, alone, the daring act of Admiral Farragut in passing the forts and encountering the imperfectly known dangers above, is really to detract from his fame as a capable as well as gallant leader. That there were risks and accidents to be met he knew full well; that he might incur disaster he realized; that the dangers above and the power of the enemy's vessels might exceed his expectations was possible; war can not be stripped of hazard, and the anxiety of the doubtful issue is the penalty the chieftain pays for his position. But Farragut was convinced by experience and reflection that his fleet could force its passage; and he saw that once above the material probabilities were that army and navy could be combined in such a position of vantage as would isolate the forts from all relief, and so "actually, directly, and materially make certain their surrender," and secure his end of controlling the lower Mississippi. There was only one road practicable to ships to pass above, and that led openly and directly under the fire of the forts; but having passed this, they were planted across the communications as squarely as if they had made a circuit of hundreds of miles, with all the secrecy of Bonaparte in 1800 and in 1805. Are strongholds never "captured" unless by "actual attack"? Did Ulm and Mantua yield to blows or to isolation?