Treatises on geometrical drawing: on the arms in use: on permanent fortification: the attack and defence of fortresses: and on military mines

Front Cover
1843 - 128 pages
0 Reviews
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Contents

Popular passages

Page 96 - ... the garrison abandon the work, the lodgment must be made openly in the breach, and be well secured along the whole excavation, but not beyond it. Afterwards the work will be extended to the right and left along the rampart by saps, forming a portion of a circle which will occupy all the terreplein of its flanked angle : from thence it will be carried along the two faces of the work till everything is duly prepared to force the intrenchment at the gorge.
Page 82 - From this calculation, it is evident, cœteris paribus, that the more numerous the garrison, the smaller the besieging army need be in proportion to it ; for the attack of a similar front or fronts of fortification is little different, if the place contain a garrison of 5 or a garrison of 10,000 men ; the guards of the trenches and the other duties increase proportionately, but the work does not. The calculation for the attack of a garrison of 10,000 men would be, Guard of the trenches 7,500, at...
Page 109 - ... which arrived at the same moment along the ditch from their right. The men mounted in a most gallant manner against an equally gallant resistance ; and it was not till after a sharp struggle of some minutes that the bayonets of the assailants prevailed, and gained them a footing on the summit of the rampart. The defenders then concentrated behind the retrenchment, which they obstinately maintained, and a second severe struggle commenced."* The lesser breach was, at the same time, assaulted with...
Page 105 - ... from shells exploding in the ditch amongst the workmen, who could not jump out in time to save themselves, the exterior excavation was discontinued altogether, and the interior of the batteries was directed to be sunken to the necessary depth to furnish earth for the parapets. About this time also the garrison adopted the expedient of firing shells filled with powder, and having long fuses in salvos. Some of these falling together into the parapets blew away in an instant the work of hours.*...
Page 82 - ... a garrison of 10,000 men would be, Guard of the trenches 7,500, at three reliefs, 22,500 Working-parties 2,000 men, at four reliefs, . 8,000 30,500 Duties of the army one-tenth, at four reliefs, 12,200 Total, independent of sick and casualties, 42,700 The former being nearly in the proportion of 5 to 1, and the latter of 4 to 1. Hence it is that the most celebrated commanders and best engineers are agreed as a general principle, that the besieging army should vary in its proportion to the strength...
Page 96 - ... carried as far forward as possible, without encumbering the trenches, and piled on the reverse of them. Care must be taken .that all the lodgments from which it is possible to fire on the part to be attacked, are in a perfect state, and that the batteries of cannon, mortars, and pierriers, are in readiness to open; and the officers commanding in the batteries and lodgments, should have it fully explained to them on the spot, how they are to act according to the signals made. " The signal may...
Page 81 - ... proportion of rest to duty, and also the number of his troops which he deems equal to cope with the garrison ; and then the detail follows as matter of course. The following seems the minimum of the calculation. Guard of the trenches, three-fourths of the strength of the garrison. This duty may be taken for a short service with three reliefs. The workmen, however, cannot do with less than four reliefs. Their numbers depend upon the trace of the work to be attacked ; but, for the sake of calculation,...
Page 118 - The line drawn from the centre of the charge to the edge of the crater is called the radius of explosion. A crater of which the diameter is equal to the line of least resistance, is called a one-lined crater; when the diameter is double the line of least resistance, a two-lined crater, and so on.
Page 96 - Should that occur, as soon as the sappers are off the breach, the signal is made and all the batteries and lodgments instantly open a heavy fire on the enemy, who cannot remain under it, but will quickly disperse. As soon as that is perceived the flag must be lowered, and the sappers again sent forward, who resuming their work, will push it forward as much as possible ; again abandoning it, however, whenever the enemy make their appearance, which may occur a second and even a third time. Each time,...
Page 117 - When charges of powder are fired under the surface of the ground, the effects caused by their explosion necessarily depend on the quantity of powder used, on the depth below the surface at which it is placed, and on the nature of the soil. Besides...

Bibliographic information