If diplomatic means do not suffice to adjust a dispute, then the question of right between two states at once becomes a question of might. But the existence of a spirit of fair play is taken into account nevertheless, for each party to the controversy will seek to have the justice of its cause recognized. The moral support engendered by fighting for a just cause is so great that no state is willing to dispense with it.[4] This circumstance, coupled with the growing power of public opinion and with the influence of representative government, has contributed to reduce the number of wars. Wars between cabinets, like those in the days of Louis XIV., are no longer possible. As a result of the universal liability to service, the whole nation takes part in a war; every class of society suffers and has its pursuits interfered with; everything presses to an early decision, to a prompt crushing of the opponent. [4] “If princes wish war they proceed to make war and then send for an industrious jurist who demonstrates that it is therefore right.” FREDERICK II. “Every war is just which is necessary and every battle holy in which lies our last hope.” MACHIAVELLI, _Il Principe_. This is attained by defeating the enemy’s forces, by occupying the hostile country and seizing the enemy’s sources of supply, so that he will be convinced of the futility of further resistance. (Campaigns of 1859, 1866, and 1870-71). Only in the rarest cases will it be necessary to continue the war until the power of resistance of the hostile state is completely destroyed. (American Civil War). The extent to which the enemy’s power of resistance may have to be crippled or broken, in order to compel peace, depends upon his tenacity. Political considerations will also have to be taken into account in answering this question. From the military point of view, however, the purpose of every war will always be the complete overthrow of the enemy. 2. STRATEGY AND TACTICS. Precise definitions of strategy and tactics, clearly fixing the scope of each, have been vainly sought in the past. That efforts in this direction have led to no results is only natural, as tactics and strategy are complementary subjects that often encroach upon each other, while grand tactics is frequently identical with strategy.