The battle field is a perfect kaleidoscope. The best we can hope to get out of books is a guide—something that we will keep in our minds to help us decide the best way to meet certain situations. He who tries to remember a particular position taught in his school with the idea of applying that to actual use in battle is laying the foundation for absolute failure. Your expert rifleman never thinks back when he goes to fire a shot as to just what his instructor told him or what the book said. He just concentrates his mind on the object to be attained, using so far as comes to him facts he has learned from books or teachers. Your general and your staff must do the same. =Infantry Use of Gas.= A few words about how we will use gas in the future. We will start with the Infantry. The Infantry as such will use gas in only two or three ways. They will use some gas in rifle grenades, and a great deal more smoke. We speak of the rifle grenade because in our opinion the hand grenade is a thing of the past. We do not believe there will ever be used in the future any grenade that is not applicable to the rifle. The Infantry will probably often carry large quantities of gas in the shape of the toxic smoke candle. These materials being solids may be shot up by rifles or artillery fire, run over by trucks or tractors, or trampled and still be harmless. It is only when the fuses are lighted and the material driven off by heat that they are dangerous. In using these candles under these conditions you must have sufficient chemical warfare officers and soldiers to get the necessary control indicated by the sun, wind, woods, fogs, ravines and the like. =Cavalry Use of Gas.= Next consider the Cavalry. The Cavalry will use gas practically the same as the Infantry. The chemical warfare troops will accompany the Cavalry with Stokes’ mortars or other materials to fire gases into small enemy strongholds that may be encountered whether machine gun nests, mountain tops, woods or villages. They will do this either against savages or civilized people. Methods of making these materials mobile for that purpose are already well under way. If against savages and one does not want to kill them, use tear gases—no better method of searching out hidden snipers in mountain tops, among rocks, or villages, in ravines, or in forests was ever invented. =Use of Gas by Tanks.= The tanks will employ gas in the same way as the Infantry with the possibility, however, that they may be used to carry large quantities of gas on caterpillar tractors where otherwise it would be difficult to move the gas. This is not a certainty, but is a situation promising enough to warrant further study.