Let there be an armament composed of infantry, cavalry, and marines, and let a number of triremes cover the sea, and phalanxes of foot and horse cover most of the plains, and the ridges of the mountains, and let the metal of their armor reflect the sunshine, and the glitter of the helmets and shields be reflected by the beams which are emitted from them; let the clashing of spears and the neighing of horses be borne up to the very heavens, and let neither sea nor land appear, but only brass and iron in every direction. Let the enemy be drawn up in battle array opposite to these, fierce and savage men, and let the time of the engagement be now at hand. Then let some one suddenly seize some young lad, one of those brought up in the country, knowing nothing but the use of the shepherd's pipe and crook; let him be clad in brazen armor, and let him be led round the whole camp and be shown the squadrons and their officers, the archers, slingers, captains, generals, the foot and horse, the spearmen, the triremes and their commanders, the dense mass of soldiers in the ships, and the multitude of engines of war lying ready on board. Let him be shown, moreover, the whole array of the enemy, their repulsive aspect, and the varied stores and unusual quantity of their arms; the ravines also and precipices of the mountains, deep and difficult. Let him be shown further on the enemies' side, horses flying by some enchantment and infantry borne through the air, and sorcery of every power and form; and let him consider the calamities of war, the cloud of spears, the hailstorm of arrows, that great mist and obscurity that gloomiest night which the multitude of weapons occasions, eclipsing the sunbeams with their cloud, the dust no less than the darkness baffling the eyesight. The torrents of blood, the groanings of the falling, the shouts of the surviving, the heaps of slain, wheels bathed in blood, horses with their riders thrown headlong down, owing to the number of corpses, the ground a scene of general confusion, blood, and bows, and arrows, hoofs of horses and heads of men lying together, a human arm and a chariot wheel and a helmet, a breast pierced through, brains sticking to swords, the point of a dart broken off with an eye transfixed upon it. Then let him reckon up the sufferings of the naval force, the triremes burning in the midst of the waves, and sinking with their armed crews, the roaring of the sea, the tumult of the sailors, the shout of the soldiers, the foam of the waves mixed with blood, and dashing over into all the ships; the corpses on the decks, some sinking, some floating, some cast upon the beach, overwhelmed by the waves, and obstructing the passage of the ships. And when he has been carefully instructed in all the tragedy of warfare, let the horrors of captivity and of slavery be added to it, worse than any kind of death; and having told him all this, bid him mount his horse straightway, and take command of all that armament.
Do you really think that this lad would be equal to more than the mere description, and would not, at the very first glance, lose heart?
Source: On the Priesthood (New Advent)