Plate 8, Fig. 1, represents one of the most important uses that can be
made of Rockets for field service; it is that of the Rocket Ambuscade
for the defence of a pass, or for covering the retreat of an army,
by placing any number, hundreds or thousands, of 32 or 24-pounder
shell Rockets, or of 32-pounder Rockets, armed with 18-pounder shot,
limited as to quantity only by the importance of the object, which
is to be obtained; as by this means, the most extensive destruction,
even amounting to annihilation, may be carried amongst the ranks of an
advancing enemy, and that with the exposure of scarcely an individual.
The Rockets are laid in rows or batteries of 100 or 500 in a row,
according to the extent of ground to be protected. They are to be
concealed either in high grass, or masked in any other convenient
way; and the ambuscade may be formed of any required number of these
batteries, one behind the other, each battery being prepared to be
discharged in a volley, by leaders of quick match: so that one man is,
in fact, alone sufficient to fire the whole in succession, beginning
with that nearest to the enemy, as soon as he shall have perceived
them near enough to warrant his firing. Where the batteries are very
extensive, each battery may be sub-divided into smaller parts, with
separate trains to each, so that the whole, or any particular division
of each battery, may be fired, according to the number and position of
the enemy advancing. Trains, or leaders, are provided for this service,
of a particular construction, being a sort of flannel saucissons,
with two or three threads of slow match, which will strike laterally
at all points, and are therefore very easy of application; requiring
only to be passed from Rocket to Rocket, crossing the vents, by which
arrangement the fire running along, from vent to vent, is sure to
strike every Rocket in quick succession, without their disturbing each
others’ direction in going off, which they might otherwise do, being
placed within 18 inches apart, if all were positively fired at the same
instant.
Fig. 2 is a somewhat similar application, but not so much in the nature
of an ambuscade as of an open defence. Here a very low work is thrown
up, for the defence of a post, or of a chain of posts, consisting
merely of as much earth and turf as is sufficient to form the sides of
shallow embrasures for the large Rockets, placed from two to three feet
apart, or nearer; from which the Rockets are supposed to be discharged
independently, by a certain number of artillery-men, employed to keep
up the fire, according to the necessity of the case.
It is evident, that by this mode, an incessant and tremendous fire may
be maintained, which it would be next to impossible for an advancing
enemy to pass through, not only from its quantity and the weight and
destructive nature of the ammunition, but from the closeness of its
lines and its contiguity to the ground; leaving, in fact, no space in
front which must not be passed over and ploughed up after very few
rounds.
As both these operations are supposed to be employed in defensive
warfare, and therefore in fixed stations, there is no difficulty
involved in the establishment of a sufficient depôt of ammunition for
carrying them on upon the most extensive scale; though it is obviously
impossible to accomplish any thing approaching this system of defence,
by the ordinary means of artillery.
[Illustration: _Plate 8_ Fig. 1 Fig. 2]