| Modern prisons are modelled after John Stuart Mill's panopticon, and sentries can indeed see everything. |
| But only the tumbleweeds, sagebrush and cactus, that stood like splintered sentries, were visible in this vast wilderness. |
| Dozens of sentries and crossbowmen kept watch on the battlements, and mounted cavalry patrolled the keep walls and the surrounding area. |
| The fluted sea cliffs, or pali, rise like sentries straight up from the green valleys and white sand beaches below. |
| Here, apparently, royal ladies disported themselves under the watchful gaze of women sentries. |
| Whilst waiting for the wagons, the boys organised sentries, checked their horses' tack, loaded their revolvers and relaxed. |
