The art of the indirect approach can only be mastered, and its full scope appreciated, by study of and reflection upon the whole history of war. But we can at least crystallize the lessons into two simple maxims- one negative, the other positive. The first is that, in face of the overwhelming evidence of history, no general is justified in launching his troops to a direct attack upon an enemy firmly in position. The second, that instead of seeking to upset the enemy's equilibrium by one's attack, it must be upset before a real attack is, or can be successfully launched
B. H. Liddell HartIt is folly to imagine that the aggressive types, whether individuals or nations, can be bought off ... since the payment of danegeld stimulates a demand for more danegeld. But they can be curbed. Their very belief in force makes them more susceptible to the deterrent effect of a formidable opposing force.
B. H. Liddell HartThe effect to be sought is the dislocation of the opponent's mind and dispositions - such an effect is the true gauge of an indirect approach.
B. H. Liddell HartFor whoever habitually suppresses the truth in the interests of tact will produce a deformity from the womb of his thought.
B. H. Liddell Hart