"Jove! You did give me a start." He laughed a little shakily. "Where have you been?" "Circling round you, son, dusting your face with my glove. Understand now what I meant by helpless in the dark?" Thus ended the first lesson. . . . The others followed in due course. The correct way to crawl through grass so as to avoid being mistaken for a rhinoceros going to water; the power of observation so as to be able to spot a change in the German trenches--maybe, only a few sand bags moved, but just enough to place the position of a machine gun; the value of disguise to defeat the curious on the other side; patience, the way to fire a rifle, the use of his eyes. All these and certain other things was he taught. And the certain other things were mysterious and secret. They occurred at odd times and in odd places, and the instructor was always Shorty Bill personally. "Some men," he would say, "like killing with a rifle; I do for one. Some like killing with a revolver; not bad either, and essential, son, when you're out on the tiles by night and can't carry a rifle. A rifle is a dam nuisance at night if one's on patrol, whatever any one says to the contrary. An' if you don't carry a gun you can't use a bayonet, which is a beautiful method of sticking 'em." Shorty thoughtfully removed his pipe. "I was almost converted to the bayonet one day by a pal of mine. He's dead now, poor devil, but he lived well. He was givin' tongue over the beauties of picking Huns out of dug-out entrances with the bayonet like winkles out of their shells with a pin. Gosh! it was great--that boy's palaver. He almost converted me, an' then I showed him a couple o' little stunts of mine." Shorty put his pipe in his pocket. "Come here, son, an' pay attention. It was through forgetting in the excitement of the moment and not payin' attention that my pal the winkle plucker went west." Thus the mysterious lesson would start. "There'll come a time one night, boy, when you're out in the dark, an' you're crawling near the wire, when you'll feel on a sudden there's some one near you. Maybe, by the smell of him, you'll know it's a Boche. Well--then it's up to you to make good. You can plug him with your hand gun when you've got his dirty face dead set; but if you start shooting practice in No Man's Land, the audience join in. So I'll just show you a couple o' little tricks--silent tricks, which you can use when you get your hands on him. They kill just as clean if not cleaner than a gun, and no one's the wiser. Now come at me as if you meant to hurt me. No; not as if you were out pushing the baby in the pram, but just as if you was goin' all out to kill me. That's better, son; an' where are you now?"