Having taken 3 years of Latin, study that included some considerable Roman history and the reading of the Gallic Wars, I commend you on a well written and informative article. With that said, I do find a disconnect.
While the title conveys the importance of "Configuration Management" and the term appears in the article in several places, I think a much more appropriate title and term would have been "Project Management." In the article I find only one or two instances where configuration management would apply. One is in the need for an outer circumvallation due to a change in environment (i.e., danger from outside attack). This changed functional requirement of the Roman defense works by adding the need to defend against attacks from without as well as within. This necessitated a change in the configuration of the overall Roman siege works, the addition of the outer wall.
Configuration management principles and processes were undoubtedly involved, whether formally or informally. Caesar's staff probably served as a CCB to perform much of the analysis for additional materials, manpower, etc. in response to this necessary change. So, it might be said that configuration management was a part of the methodology for determining the additional resource and manpower requirements; however, determining those values would be more closely akin to project management.
I suspect the Romans had a [i]standard[/i] design. (They had done many such sieges prior to Alesia, although not necessarily the double-wall variety.) If they used some basic design with [i]standard[/i] components (wall sections, towers, ditches, moats, etc.), then devising variations on those standard components would likely have been through configuration management processes. Then there would be the ensuing (and cyclic) construction (development), inspections (verification/testing), IV&V, and production.
(I said cyclic above, because as you state in your article, the Gauls did a little IV&V and found the inner wall penetrable. That's how the threat from outside arose.)
By the way, as you probably know, on his way back to Rome, Caesar and his retinue, including Vercingetorix, rode near the rear of his column, while his vanguard crucified the Gauls all the way back to Rome. In this way, he forced Vercingetorix to bear the shame of his downfall.
