He had promised Horn that the last train for the night would have been gone at this hour, for Horn had said he would do nothing that would put human lives in peril. But Horn thought only that Von Papen had misunderstood the schedules. A few moments after he had got this shock, another whistle screamed at him from the Canadian shore, and again he made his quick, precarious escape by hanging out above the river by one hand and one foot. He now decided that all schedules had been put awry, and that he must change his plans to be sure of not endangering human beings. To accomplish this, he cut off and threw away most of the fifty-minute fuse that he had brought along, and left only enough to burn three minutes. No train would come sooner than this, and then the explosion would warn everybody of the danger. In doing this, Horn deliberately cut himself off from hope of escaping capture. He had planned such an escape--an ingenious plan, too, except that it was traced on a railroad time-table map of the Maine woods in winter by a strange German fresh from the tropics. He had meant to walk back one station westward, then cut across the open country to the end of a branch line railroad, and then ride back to Boston on another line than that on which he had come east to Vanceboro. It was a clever scheme, except that it missed all the essentials, such as the thirty miles of trackless woods, the snow feet-deep upon the level, the darkness of winter nights, and the deadly cold. Still, Horn childishly believed it feasible, and he did a brave and honourable thing to throw it overboard rather than to cause the death of innocent people. He fixed the dynamite against a girder of the bridge above the Canadian bank of the river, adjusted the explosive cap, and touched his cigar to the end of the three-minute fuse. Then he stumbled back across the gale-swept, icy bridge, made no effort to escape, and walked back into the hotel in Vanceboro, with both hands frozen, as well as his ears, his feet, and his nose. A moment after he entered the hotel the dynamite exploded with a report that broke the windows in half the houses in the town and twisted rods and girders on the bridge sufficiently to make it unsafe but not enough to ruin it.