The Past Through Tomorrow by Robert A. Heinlein

of the cadets reacted almost at once, breaking ranks and striding forward. Gaines looked at them coldly. “Very well. You three turn in your weapons, and return to your quarters. Any of the rest of you that think this is a matter of private revenge, or a hunting party, may join them.” He permitted a short silence to endure before continuing. “Sacramento Sector has been seized by unauthorized persons. We are going to retake it—if possible, without loss of life on either side, and, if possible, without stopping the roads. The plan is to take over ‘down inside’, rotor by rotor, and cross connect through Stockton. The task assignment of this group is to proceed north ‘down inside’, locating and overpowering all persons in your path. You will bear in mind the probability that most of the persons you will arrest are completely innocent. Consequently, you will favor the use of sleep gas bombs, and will shoot to kill only as a last resort.
    “Cadet Captain, assign your men in squads of ten each, with squad leader. Each squad is to form a skirmish line across ‘down inside’, mounted on tumblebugs, and will proceed north at fifteen miles per hour. Leave an interval of one hundred yards between successive waves of skirmishers. Whenever a man is sighted, the entire leading wave will converge on him, arrest him, and deliver him to a transport car and then fall in as the last wave. You will assign the transports that delivered you here to receive prisoners. Instruct the drivers to keep abreast of the second wave.
    “You will assign an attack group to recapture subsector control offices, but no office is to be attacked until its subsector has been crossconnected with Stockton. Arrange liaison accordingly.
    “Any questions?” He let his eyes run over the faces of the young men. When no one spoke up, he turned back to the cadet in charge. “Very well, sir. Carry out your orders!”
    By the time the dispositions had been completed, the follow-up crew of technicians had arrived, and Gaines had given the engineer in charge his instructions. The cadets “stood to horse” alongside their poised tumblebugs. The Cadet Captain looked expectantly at Gaines. He nodded, the cadet brought his arm down smartly, and the first wave mounted and moved off.
    Gaines and Harvey mounted tumblebugs, and kept abreast of the Cadet Captain, some twenty-five yards behind the leading wave. It had been a long time since the Chief Engineer had ridden one of these silly-looking little vehicles, and he felt awkward. A tumblebug does not give a man dignity, since it is about the size and shape of a kitchen stool, gyro-stabilized on a single wheel. But it is perfectly adapted to patrolling the maze of machinery ‘down inside’, since it can go through an opening the width of a man’s shoulders, is easily controlled, and will stand patiently upright, waiting, should its rider dismount.
    The little reconnaissance car followed Gaines at a short interval, weaving in and out among the rotors, while the television and audio communicator inside continued as Gaines’ link to his other manifold responsibilities.
    The first two hundred yards of the Sacramento Sector passed without incident, then one of the skirmishers sighted a tumblebug parked by a rotor. The technician it served was checking the gauges at the rotor’s base, and did not see them approach. He was unarmed and made no resistance, but seemed surprised and indignant, as well as very bewildered.
    The little command group dropped back and permitted the new leading wave to overtake them.
    Three miles farther along the score stood thirty-seven men arrested, none killed. Two of the cadets had received minor wounds, and had been directed to retire. Only four of the prisoners had been armed, one of these Harvey had been able to identify definitely as a ringleader. Harvey expressed a desire to attempt to parley with the outlaws, if any occasion arose. Gaines agreed tentatively. He knew of Harvey’s