Military men have long been accustomed to reserve sappers and miners as helps in the emergencies of war. These always attack under cover, approaching by slow and stealthy degrees, like the tiger or the cat. They do not take the chances of actual conflict, and never expose themselves to the leaden hail of battle. When the walls of a fortress can not be battered down by direct assault, they secretly undermine them; and when the fuse is lighted, the magazine exploded, and the dead scattered in all directions, they return to their hiding-places unharmed, to share in the rewards of victory. Loyola was a skillful and courageous soldier, perfectly familiar with all the plans and strategies of war. In the organization of his society, he had availed himself of his knowledge both of the motives of men and of the movements of armies. Hence, when he submitted to the pope his proposed methods of operation, he took the precaution to impress him with its importance and necessity, by declaring that, as its head, he should consider himself "as the representative of Christ, the commander-in-chief of the heavenly hosts," and as engaged in "the war service of Christ," with an army bound by solemn oaths to obey him implicitly "in every particular, and on all occasions."[69] Hence, also, speaking of his society, he said: "We must be always ready to advance against the enemy, and be always prepared to harass him or to fall upon him, and on that account we must not venture to tie ourselves to any particular place;"[70] that is, that Jesuits must secretly skulk about over the world, without habitations or homes, and, paying no allegiance to any opposing authority, to "harass" Protestants wheresoever they are found--like freebooters upon the sea--leaving no tracks behind them. The "chief thing" with the Jesuits, says Greisinger, was to obtain the sole direction of education, so that by getting the young into their hands, they could fashion them after their own pattern, and, by holding them down to the low standard of passive and "uninquiring obedience," fit them to become subservient slaves of monarchical and papal power. Nobody need be told the impressible character of the youthful mind, or how the stamp made upon it becomes indelible. Loyola understood this, and, realizing the impossibility of arresting the progressive advancement of Germany under Protestant influences, or to uproot the tolerant spirit that prevailed there among both Protestants and Roman Catholics, by any of the usual methods of papal coercion, he insidiously planned the scheme of bringing Germany back to papal obedience by Jesuitical training in the German schools. The process was slow, it is true, but the stake was great; and no man could have known better than he how surely it would be won, if the minds of the young could be cramped and dwarfed by Jesuit teaching.