"I see something so strange in the distance, father! What in the world can it be? first it seems to be drawn in coils on the ground like a cable, then uprises as if it were a little mast, then that sinks, and the coils move along again. It is coming toward the bridge." My wife took alarm at this description, and calling the other boys, retreated into the cave, where I desired them to close up the entrances, and keep watch with firearms at the upper windows. These were openings we had made in the rock at some elevation, reached within by steps, and a kind of gallery which passed along the front of the rooms. Fritz remained by me while I examined the object through my spyglass. "It is, as I feared, an enormous serpent!" cried I; "it advances directly this way, and we shall be placed in the greatest possible danger, for it will cross the bridge to a certainty." "May we not attack it, father?" exclaimed the brave boy. "Only with the greatest caution," returned I; "it is far too formidable, and too tenacious of life, for us rashly to attempt its destruction. Thank God, we are at Rockburg, where we can keep in safe retreat, while we watch for an opportunity to destroy this frightful enemy. Go up to your mother now, and assist in preparing the firearms; I will join you directly, but I must further observe the monster's movements." Fritz left me unwilling, while I continued to watch the serpent, which was of gigantic size, and already much too near the bridge to admit of the possibility of removing that means of access to our dwelling. I recollected, too, how easily it would pass through the walls. The reptile advanced with writhing and undulatory movements, from time to time rearing its head to the height of fifteen or twenty feet, and slowly turning it about, as though on the lookout for prey. As it crossed the bridge, with a slow, suspicious motion, I withdrew, and hastily rejoined my little party, which was preparing to garrison our fortress in warlike array, but with considerable trepidation, which my presence served in a measure to allay. We placed ourselves at the upper openings, after strongly barricading everything below, and, ourselves unseen, awaited with beating hearts the further advance of the foe, which speedily became visible to us. Its movements appeared to become uncertain, as though puzzled by the trace of human habitation; it turned in different directions, coiling and uncoiling, and frequently rearing its head, but keeping about the middle of the space in front of the cave, when suddenly, as though unable to resist doing so, one after another the boys fired, and even their mother discharged her gun. The shots took not the slightest effect beyond startling the monster, whose movements were accelerated. Fritz and I also fired with steadier aim, but with the same want of success, for the monster, passing on with a gliding motion, entered the reedy marsh to the left, and entirely disappeared.