Plate 5, Fig. 1, represents a sub-division of Rocket infantry in line of march--Fig. 2, the same in action. The system here shewn is the use of the Rockets by infantry--one man in ten, or any greater proportion, carrying a frame, of very simple construction, from which the Rockets may be discharged either for ground ranges, or at high angles, and the rest carrying each three rounds of ammunition, which, for this service, is proposed to be either the 12-pounder Shell Rockets, or the 12-pounder Rocket case shot, each round equal to the 6-pounder case, and ranging 2,500 yards. So that 100 men will bring into action, in any situation where musketry can be used, nearly 300 rounds of this description of artillery, with ranges at 45°, double those of light field ordnance. The exercise and words of command are as follow: No. 1 carries the frame, which is of very simple construction, standing on legs like a theodolite, when spread, and which closes similarly for carrying. This frame requires no spunging, the Rocket being fired merely from an open cradle, from which it may be either discharged by a lock or by a portfire, in which case. No. 1 also carries the pistol, portfire-lighter, and tube box. No. 2 carries a small pouch, with the requisite small stores, such as spare tubes, portfires, &c.; and a long portfire stick. Nos. 3, 4, and 5, &c. to 10, carry each, conveniently, on his back, a pouch, containing three Rockets; and three sticks, secured together by straps and buckles. With this distribution, they advance in double files. On the word “_Halt_,” “_Prepare for action_,” being given, No. 1 spreads his frame, and with the assistance of No. 2, fixes it firmly into the ground, preparing it at the desired elevation. No. 2 then hands the portfire stick to No. 1, who prepares and lights it, while No. 2 steps back to receive the Rocket; which has been prepared by Nos. 3, 4, &c. who have fallen back about fifteen paces, on the word being given to “_Prepare for action_.” These men can always supply the ammunition quicker than it can be fired, and one or other must therefore advance towards the frame to meet No. 2 with the round prepared. No. 2 having thus received the Rocket, places it on the cradle, at the same instant that No. 1 puts a tube into the vent. No. 2 then points the frame, which has an universal traverse after the legs are fixed; he then gives the word “_Ready_,” “_Fire_,” to No. 1, who takes up his portfire and discharges the Rocket. No. 1 now sticks his portfire stick into the ground, and prepares another tube; while No. 2, as before, puts the Rocket into the frame, points, and gives the word “_Ready_,” “_Fire_,” again. By this process, from three to four Rockets a minute may, without difficulty, be fired from one frame, until the words “_Cease firing_,” “_Prepare to advance_,” or “_retreat_,” are given; when the frame is in a moment taken from the ground, and the whole party may either retire or advance