Sufficient has, I conceive, now been stated, to give the officer such a general view of the power and spirit of the weapon, as may enable him to apply it in all possible cases to the best advantage; and if he will but constantly bear in view that maxim which I have laid down as the fundamental principle of this system, I will confidently pledge myself that it will never disappoint him, either as to the physical or _moral_ effect which he may calculate on producing upon his enemy; since, he must recollect, that for this latter effect, it adds all the terrors of _visibility_ to every species of that destructive ammunition introduced by the use of gunpowder, but by every one admitted hitherto to have been qualified, as to moral effect, by its _invisibility_. _25th October, 1813._ W. CONGREVE. _Note._--All the cases of service referred to in the above instructions, will be found particularly detailed in the following plates. CONSTITUTION AND STRENGTH OF A TROOP OF ROCKET HORSE ARTILLERY. A Troop is proposed to consist of three divisions. Each division to be divided into two sub-divisions. Each sub-division to consist of five sections of three men each, and two drivers leading four ammunition horses, each mounted man carrying into action four rounds of 12-pounder Rocket ammunition, and each ammunition horse eighteen rounds; thus: Each section carries 12 rounds of ammunition into action, and one bouche a feù, and, consequently, each sub-division will have five bouches a feù, and 140 rounds of ammunition: so that the whole troop, consisting of six of those sub-divisions, will amount to 102 mounted men, and 24 ammunition horses, and will take into action, without any wheel carriage, 30 bouches a feù, and 840 rounds of ammunition. It is, however, further proposed to attach to each division two Rocket cars, one heavy and one light, the first carrying four men with 40 rounds of 24-pounder Rockets, armed with cohorn shells, the latter carrying two men, and 60 rounds of 12-pounder ammunition. Each of these cars is capable of discharging two Rockets in a volley. It is proposed, also, to attach to each sub-division a curricle ammunition cart, or tumbril, for two horses, to carry, in line of march, three rounds out of four of each mounted man’s Rockets, to ease the horse: and, in action, when every man carries his full complement of ammunition on horseback, these cars may contain a reserve of 60 rounds more for each sub-division, making the whole amount of ammunition, for each sub-division, 200 rounds. With this addition, therefore, the whole strength of the Rocket troop will stand thus: