  It is difficult to prevent an enemy, supplied with pontoons, from crossing a river. When the object of an army, which defends the passage, is to cover a siege, the moment the general has ascertained his inability to oppose the passage, he should take measures to arrive before the enemy, at an intermediate position between the river he defends and the place he desires to cover. NOTE.Here we may observe, that this intermediate position should be reconnoitred, or rather, well entrenched beforehand; for the enemy will be unable to make an offensive movement against the corps employed in the siege, until he has beaten the army of observation; and the latter, under cover of its camp, may always await a favorable opportunity to attack him in flank or in rear. Besides, the army which is once entrenched in this manner, has the advantage of being |
|
