It had hardly gone a hundred yards before two rifle-shots rang out of the forest, and one ball crashed through both windows of the cab, but without harming its occupants. Glen started; but his hand did not leave the throttle, nor did his gaze swerve for an instant from the line of gleaming track ahead. He had no time then to think of his own safety. He was too busy thinking of the safety of those so suddenly and unexpectedly intrusted to him.