... walls of towns. In general, temporary remains are often barely visible with an absence of buildings within their defensive lines; whereas permanent installations are among the most conspicuous and notable remains of Roman Britain. The sites of these more permanent garrison stations are usually well defined and easily recognized. The ridges of their ramparts, whether of earth or built-stone, are often easily detected. The ditches are rarely filled to such a degree that their hollows can not be seen. The positions of the gates generally show as breaks in the continuity of the ramparts. If the interiors have not destroyed by ploughing, the lines of the chief thoroughfares and the sites of the buildings may often be traced, and sometimes these surface indications may be obvious enough see plans showing all the most important features The marching camps built by the Roman army on campaigns seemed so perfectly organised, that the style ...

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