Note (Back) — Chapter V

Where such unfavourable conditions obtain, the principle which dominates all correct defensive action receives a special application. The principle is that every defensive disposition should look to offensive action—or at the least to offensive effect. Mere defence is ultimate ruin. "In the long run," said Napoleon, "no position whatever can be defended if it does not threaten the enemy."[15] Consequently, the force that for any, or several, of the reasons above given cannot safely keep the field must establish itself solidly in some place where, for whatsoever advantages, it is as far as possible itself secure; but whence at the same time—and this is the more important of the two considerations—it most effectually menaces the enemy. This it does by applying again, but in another manner, the flanking, or turning, idea—by placing itself across or to one side of the line of communications upon which the enemy will depend, if he ventures to advance in the direction which the defendant has not felt himself strong enough otherwise to contest. Of such offensive-defensive positions there are many historical examples. Among these the most recently conspicuous was the occupation of Plevna by the Turks in 1877, and the long consequent arrest of the Russian progress; but Mantua, in 1796, in like manner and for the same reasons, effectually stopped Bonaparte for eight months, and Genoa, in 1800, so long delayed the Austrians as to reverse the issues of the campaign signalised by the name of Marengo.