[Illustration: 4] All that has been said as to protecting the ammunition and stores will apply to this work as it did to the village. If a spring of water can be included, as at ‘O’, this will be found of incalculable advantage. Of all forms of defensive ramparts the straight line is the worst; if time does not permit a work with bastions, however irregular, an enclosure shaped somewhat like a star is serviceable (shown in Diagram 6, Figs. ‘A’, ‘B’ and ‘C’). Should an enclosed work be impracticable, the line should have its ends (or ‘flanks’) strongly guarded, and be broken up, as in Diagram 5 ‘D’ into short straight lines nearly at right angles, to serve for mutual support. This principle of mutual support, however achieved, is called that of ‘defensive relations’, and is capable of adaptation to all kinds of defensive works, whether of a few men beleaguered in an improvised fortification, a considerable number in a scientifically constructed work--permanent or field fortification--a fortress with an entire army behind its ramparts, or a cordon of forts surrounding a great city. [Illustration: 5, 6] The ground plan of the work having been decided upon and staked out the men start in with pick and shovel, digging, if possible, a ditch, and throwing the material into the shape of the shaded portion of Diagram 7. The ditch, outside the fort, indicated by the figure ‘FGHJ’ serves the twofold purpose of getting material for the parapet ‘ABCDEF’, and for embarrassing an enemy in any attempt at assault. To further embarrass him every sort of obstacle that may be at hand should be put to use--trees, butts turned our way, boughs interlacing; stakes driven deep into the soil close together; barbed wires wound in and out; in short, every expedient that may delay his advance and keep him as long as possible exposed to our most effective fire. [Illustration: 7] The drawing (7) was made with no attempt at exactness of proportion, and simply to show the essentials; the slope ‘EF’ is made as steep as the nature of the soil will permit; ‘DE’ slopes enough to enable a soldier standing upon ‘BC’ to fire upon an enemy entangled among the obstacles at ‘J’, but never enough to weaken the mass of earth at and near ‘D’. Observe how common-sensible all these arrangements are; not one too many or too few; just the things that a practical man, if he could think as he felt, would do if suddenly called to command with an enemy advancing upon him. Unfortunately, perhaps, for the purposes of a patriotic and peaceful people, men are inclined, even though brave as courage itself, to get nervous or nerveless in the immediate presence of danger. This is the reason, rather than for any especial erudition involved in war’s art, that we need trained soldiers--men trained to think mechanically and to act automatically amid the uproar of battle. [Illustration: 8]