Shell Extractor. An instrument for extracting headless cartridge-cases from breech-loading small-arms.

Shell-hooks. See [Implements].

Shelling. The act of bombarding a fort, town, or position.

Shell-jacket. An undress military jacket.

Shell-plug Screw. See [Implements].

Shell-proof. Capable of resisting bomb-shells.

Shells. Hollow projectiles; also, the cases of metallic cartridges for use in small-arms. See [Projectiles].

Shelter. In a military sense, that which protects the troops in the field. There are various means resorted to for this purpose. A common arrangement is as follows: A cross-bar is supported by two uprights; against this cross-bar a number of poles are made to lean; on the back of the poles abundance of fir branches are laid horizontally; and lastly, on the back of the fir branches is another set of leaning poles, in order to make all secure by their weight. A cloth of any kind is made use of to give shelter by an arrangement of this kind. The corners of the cloth should be secured by a simple hitch in the rope, and not by a knot. The former is sufficient for all purposes of security, but the latter will jam, and you may have to injure both cloth and string to get it loose again. It is convenient to pin a skewer in the middle of the sides of the cloth, round the ropes.

Shelter-tents affording an excellent protection for 6 soldiers may be made as follows: Three tent-sticks are fixed into the ground, whose tops are notched; a light cord is then passed round their tops, and fastened into the ground with a peg at each end. Two sheets are then buttoned together and thrown over the cord, then two others, which are buttoned to the previous ones. Lastly, another sheet is thrown over each of the slanting cords, and buttoned to the others. The sides of the tent are, of course, pegged to the ground. There are many modifications in the way of pitching these tents. For want of sticks muskets can be used.

Huts are also frequently used as a means of protection by troops, as there is scarcely any place which does not furnish materials for their construction.