We have only allotted to this prominent conception, in the world of ordinary military theory, a special chapter in dictionary fashion, that it may the more easily be found; for we do not believe that anything independent in itself is denoted by the term.
Every position which is to be held, even if the enemy passes by it, is a flank position; for from the moment that he does so it can have no other efficacy but that which it exercises on the enemy’s strategic flank. Therefore, necessarily, all strong positions are flank positions as well; for as they cannot be attacked, the enemy accordingly is driven to pass them by, therefore they can only have a value by their influence on his strategic flank. The direction of the proper front of a strong position is quite immaterial, whether it runs parallel with the enemy’s strategic flank, as Colberg, or at right angles as Bunzelwitz and Drissa, for a strong position must front every way.
But it may also be desirable still to maintain a position which is not unassailable, even if the enemy passes by it, should its situation, for instance, give us such a preponderating advantage in the comparative relations of the lines of retreat and communication, that we can not only make an efficacious attack on the strategic flank of the advancing enemy, but also that the enemy alarmed for his own retreat is unable to seize ours entirely; for if that last is not the case, then because our position is not a strong, that is not an unassailable one, we should run the risk of being obliged to fight without having the command of any retreat.
The year 1806 affords an example which throws a light on this. The disposition of the Prussian army, on the right bank of the Saal, might in respect to Buonaparte’s advance by Hof, have become in every sense a