The photographs having been developed, the number of possible places was somewhat reduced, and we then went up again and searched for the gun in the marked spots and took more photographs. Of course the German gunners were much too clever to loose off their piece when we were searching; the flash of discharge would have given away their position at once. For three days we searched and photographed, up and down, over a few square miles, using up several dozen of the best plates procurable, with a camera specially made for the work. Eventually we proved the existence of a small light railway—almost a toy—along which trucks, containing one shell only, were pushed by hand. This railway, being connected to one of the Belgian State Railways in German hands, provided the necessities of life and ammunition for the daily Hate of the gun. The blast of the gun had also destroyed and damaged some small trees and bushes on each side of the line of fire, and this gave us a further clue. The gun itself had been mounted on one of the famous concrete foundations, inside a small building which was part of an innocent-looking farm. It was completely hidden from view, and fired out through the big double doors of the barn. Having at last solved the problem of the position of this gun, it was arranged to destroy it next day. One of our own heavy guns was brought up within range and concealed behind a hill during the night. The concealment was so perfect that when we went up next day, we were at first bitterly disappointed, because we thought that our gun had failed to arrive; however, a welcome signal from the ground informed us that it was ready to perform its share of the entertainment. The gunners had been previously shown the position of the farm, with the German gun inside it, on the map, but they could not see it and had to fire entirely by calculations. The first shot went a few hundred yards short; the second a hundred yards over it; the third a little bit to the right; the fourth and fifth demolished the farm, with our latest form of high-explosive shell; the sixth and seventh also went straight in and completed the destruction of the gun and its ammunition supply, which was stored quite close, there being nothing left except a large volume of thick black smoke. The explosions were terrific and were audible for miles around.