Industries of war within the sector of the guerrilla army must be the product of a rather long evolution; they also depend upon control of territory in a geographic situation favorable for the guerrilla. At a time when there are liberated zones and when the enemy establishes strict blockades over all supplies, different departments will be organized as necessary, in the manner already described. There are two fundamental industries, of which one is the manufacture of shoes and leather goods. It is not possible for a troop to walk without shoes in wooded zones, hilly, with many rocks and thorns. It is very difficult to march without shoes in such conditions; only the natives, and not all of them, can do it. The rest must have shoes. The industry is divided into two parts, one for putting on half-soles and repairing damaged shoes; the other will be devoted to the manufacture of rough shoes. There should be a small but complete apparatus for making shoes; since this is a simple industry practiced by many people in such regions it is very easy to procure. Connected with the shoe repair works there ought always to be a shop making all classes of canvas and leather goods for use by the troop, such as cartridge belts and knapsacks. Although these articles are not vital, they contribute to comfort and give a feeling of autonomy, of adequate supply, and of self-reliance to the troop.

An armory is the other fundamental industry for the small internal organization of the guerrilla band. This also has different functions: that of simple repair of damaged weapons, of rifles, and other available arms; the function of manufacturing certain types of combat arms that the inventiveness of the people will create; and the preparation of mines with various mechanisms. When conditions permit, equipment for the manufacture of powder may be added. If it is possible to manufacture the explosive as well as the percussion mechanisms in free territory, brilliant achievements can be scored in this category, which is a very important one, because communications by road can be completely paralyzed by the adequate employment of mines.

Another group of industries that has its importance will make iron and tin products. In the iron works will be centered all labor connected with the equipping of the mules, such as making their shoes. In the tin works the fabrication of plates and especially of canteens is important. A foundry can be joined with the tin works. By melting soft metals it is possible to make grenades, which with a special type of charge will contribute in an important way to the armament of the troop. There ought to be a technical team for general repair and construction work of varied types, the "service battery," as it is called in regular armies. With the guerrillas it would operate as such, taking care of all necessities, but without any vestige of the bureaucratic spirit.

Someone must be in charge of communications. He will have as his responsibility not only propaganda communications, such as radio directed toward the outside, but also telephones and roads of all types. We will use the civil organization as necessary in order to perform his duties effectively. Remember that we are in a period of war subject to attack by the military and that often many lives depend upon timely communication.

For accommodating the troop it is well to have cigarette and cigar factories. The leaf can be bought in selected places and carried to free territory where the articles for consumption by the soldiers can be manufactured. An industry for preparing leather from hides is also of great importance. All these are simple enterprises that can operate quite well anywhere and are easy to establish in the guerrilla situation. The industry for making leather requires some small construction with cement; also it uses large amounts of salt; but it will be an enormous advantage to the shoe industry to have its own supply of raw material. Salt should be made in revolutionary territory and accumulated in large quantities. It is made by evaporating water of a high saline concentration. The sea is the best source, though there may be others. It is not necessary to purify it of other ingredients for purposes of consumption, though these give it a flavor that is disagreeable at first.

Meat should be conserved in the form of jerked beef, which is easy to prepare. This can save many lives among the troop in extreme situations. It can be conserved with salt in large barrels for a fairly long time, and it can then be eaten in any circumstances.