In order to intelligently distribute propaganda by balloon, it was first of all necessary to ascertain the actual state of the enemy’s morale, which was principally done by questioning prisoners. The officers in charge of the work—all of whom possessed, of course, a fluent knowledge of German—after carefully studying the daily intelligence reports at General Headquarters, would visit the war-cages near Toul and Souilly and hold long interviews with prisoners of all ranks and from all parts of the empire. By this means it was possible to gauge with a considerable degree of accuracy the existing conditions beyond the Rhine and the degree of importance which various sections of the German people attached to America’s entry into the war. Arguments which had been suggested as suitable for propaganda use were tried out on the prisoners and their effect noted. Specimens of Allied propaganda were discussed with them and they were asked to give their opinions of it. A sufficient knowledge was thus gained of the Teutons’ mental processes to give the officers of the Propaganda Section a fairly accurate idea of the sort of arguments which would make the strongest appeal. The text of the proposed literature was then prepared and, after being approved by General Headquarters, was printed in Paris, the leaflets being sent to the field-stations which the Propaganda Section had established at Bar-le-Duc and Toul. As a result of the close liaison maintained with the Air Service, leaflets were sent to the various flying-fields for distribution by airplane, careful records being kept of the areas thus covered. Almost from the start the liveliest interest was shown and the heartiest co-operation afforded by all branches of the army concerned. The Meteorological Section of the Signal Corps carried on an elaborate series of experiments to determine the rate of ascension of the various types of balloons. The G-2’s of many corps and divisions constantly sent in requests for propaganda and offered many suggestions. And the aviators, who were, after all, the ones most directly concerned, showed not the slightest hesitation in undertaking the exceedingly dangerous work of distribution, for more than one German commander announced that he would execute any flyer captured in the act of distributing propagandist literature. In only one quarter was opposition encountered. That was where the out-of-date conviction was still held that “propaganda has no place during operations.”