As long as the enemy remains on the other side of a river which you wish to cross, all
force is useless, and recourse must be made to stratagem. To be informed how we are to
pass a large river, we have only to consult Caesar's passage of the Rhine, that of the Po
by Prince Eugene, or of the Rhine by Prince Charles of Lorraine. These generals sent out
detachments to impose upon the enemy, and conceal the spot where they intended to pass.
They made every preparation for the building of bridges in places where they had no idea
of employing them, whilst the main body of the army, by a night march, gained a
considerable distance from the enemy, and had time to pass the river before the troop, who
were to dispute their passage, could be put in order to prevent them. We generally
choose to cross rivers at those parts where there are some small islands, as they forward
the business very materially. We wish also to meet on the other side with woods or other
obstacles, that may prevent the enemy from attacking us before we have had time to get
into proper order.
The most prudent measures and the most particular attention are required in enterprises
of this nature. The boats or pontoons with every other article of necessary apparatus must
be at the rendezvous by the appointed hour, and every boatman well
instructed what generally attends expeditions by night. Everything being arranged, the
troops are to pass over and establish themselves on the other side of the river.
Whenever rivers are to be crossed, care should be taken that the two heads of the
bridge be entrenched, and well furnished with troops. The islands which are in the
neighborhood should be fortified, in order to support the entrenchments, and prevent the
enemy, during your operations, from seizing or destroying the bridges.
If the rivers be narrow, we choose our passage at those parts where they form angles,
and where the bank, by being a little more elevated, commands that on the opposite side.
On this spot we place as many cannon, with a proportionate number of troops, as the
ground will allow, under the protection of which the bridges are to be built; and as the
ground grows narrower on account of the angle, we are to advance but very little, and
insensibly gain ground as the troops pass.
If there be any fords, we slope the ground leading to them, to enable the cavalry to
pass.
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