The range finders, without special orders to that effect, measure the range to targets as they appear, or to fixed points, and call it out to the battery commander. The battery commander designates the target, the range, and the kind of fire to be used. The platoon commanders assign a section of the target to each of their guns, designate the elevation that is to be used, and supervise the service of the guns; they are especially held responsible that the fire is directed upon the proper target. Platoon commanders constantly observe through their field glasses the strike of the bullets and the enemy. The commander of the gun carriages is charged with their supervision; he constantly sends forward ammunition, and, when necessary, men and matériel, into the firing position. When the detached guns change position, he follows the movement under cover with the gun carriages, bringing them as close to the firing position as possible. After machine gun batteries had been employed at maneuvers as an auxiliary arm of the cavalry, they did especially good work in the fights in Southwest Africa,[292] where they were not opposed by artillery. [292] _Militär-Wochenblatt_, 1904, Nos. 136, 139 and 140. Through their ability to follow a skirmish line into the densest thickets, they were a valuable support to the infantry in the close country in which the African fights took place, where artillery of necessity had to fail owing to absence of a clear field of view. It was demonstrated, however, that the machine gun squads became so engrossed in the work of serving their guns that supporting troops had to guard them against surprise.