"My dear old boy," laughed Bill, as he sat down. "I don't know your friend Petersen, and I have not the slightest hesitation in saying that he is in all probability quite right. But the information seems to be about as much use as the fact that it is cold in Labrador." "I wonder," answered Brent, thoughtfully--"I wonder." He was rummaging through a pile of papers in the stationery box. The other two men looked at one another significantly. "What hare-brained scheme have you got in your mind now, Brent?" asked the Major. Brent came slowly across the cellar and sat down with a sheet of paper spread out on his knee. For a while he examined it in silence, comparing it with an ordnance map, and then he spoke. "It's brick, and the drop is sixty feet, according to this--with the depth of the water fifteen." "And the answer is a lemon. What on earth are you talking about, Jim?" "The railway bridge over the river before the line forks." "Good Lord! My good fellow," cried the Major, irritably, "don't be absurd. Are you proposing to blow it up?" His tone was ponderously sarcastic. "Not exactly," answered the unperturbed Brent, "but something of the sort--if I can get permission." The two men laid down their knives and stared at him solemnly. "You are, I believe, a sapper officer," commenced the Major. "May I ask first how much gun-cotton you think will be necessary to blow up a railway bridge which gives a sixty-foot drop into water; second, how you propose to get it there; third, how you propose to get yourself there; and fourth, why do you talk such rot?" Jim Brent laughed and helped himself to whisky. "The answer to the first question is unknown at present, but inquiries of my secretary will be welcomed--probably about a thousand pounds. The answer to the second question is that I don't. The answer to the third is--somehow; and for the fourth question I must ask for notice." "What the devil are you driving at, Jim?" said the Staff-captain, puzzled. "If you don't get the stuff there, how the deuce are you going to blow up the bridge?" "You may take it from me, Bill, that I may be mad, but I never anticipated marching through German Belgium with a party of sappers and a G.S. wagon full of gun-cotton. Oh, no--it's a one-man show." "But," ejaculated the Major, "how the----" "Have you ever thought, sir," interrupted Brent, "what would be the result if, as a heavy train was passing over a bridge, you cut one rail just in front of the engine?" "But----" the Major again started to speak, and was again cut short.