The positioning of the legions of the Imperial Roman army provides a window into both the thinking and the course of events during the period from 30 B.C. to 300 A.D. When one can identify the locations and date the redeployments of the legions, it is possible to recreate the planning that caused the army to be so placed. Redeployments, of necessity, shows a major shift of events or a significant refocussing of the strategic thinking of the then ruling emperor at that particular moment. This book starts from the assumption that a legions headquarters remained at a base until that legion was...