sentences:  Behind the major structures were two rows of smaller four-to-seven-man pillboxes that mirrored their larger relatives, with a well protected front and lateral cross fire to stop any enemy that managed to get on top of the fort, or come up from behind.Most of the lines consisted of just the smaller pillboxes.The "light objects" were simple hollow boxes with one or two machine gun positions, a retractable observation periscope, grenade tubes, hand-operated air blower, and a solid inner door at 90 degrees to a steel bar outer door.