We had a great lot of trouble with wireless equipment in our artillery adjustments. When anything went wrong it was always blamed on the radio attached to the airplanes and we, of course, always attributed the fault to the artillery station on the ground because our wireless sets were always tested from the air to our own squadron station before starting on any mission. If the radio was not working, we always came down and fixed it. But this continual, unsatisfactory coöperation on radio communication was a serious affair all the way through and it was a bone of contention between the Air Service and the Artillery in many instances. Finally radio officers were appointed to inspect the equipment on the airplane and the equipment on the ground and to determine where the fault lay. This helped some, but the trouble was never actually overcome. If the trouble was with the airmen, it was perhaps due to failure to throw in their switch. An experience I had, led me to believe that the trouble was more with the personnel than the material. In each artillery regiment in trench warfare, there was one battery designated to fire upon a sudden call from the airplane. This battery was known as the fugitive target battery and the wireless crew was supposed to be constantly on duty from daybreak until nightfall so that when an airplane called, the designated battery could be immediately notified and the adjustment of artillery fire undertaken at once. One day I decided to make a thorough reconnaissance of the Front and to call the fugitive target battery to a certain regiment to make a rapid adjustment. I crossed the line, found my target, which was a small convoy on the road within a forest. I was well within range of the fugitive target battery, so I immediately began to call the wireless station of the battery. I called it for fully twenty-five minutes but I could get no response. They did not put out any panel at all. I happened to know the location of the wireless station in the next regiment, which was also supposed to be looking out for fugitive target calls, so I called them and they immediately displayed their panel that they understood me. I was then certain that my wireless was O. K., so I flew back to my first battery and began to call them again. After another fifteen minutes I still received no response whatsoever. As the target had long since disappeared and being without the range of the alert battery of the next regiment, I flew home.