Partly because of the "commentaries," we know that Caesar must have developed, over several years, one of the greatest teams of Roman engineers and administrators ever assembled in an army - bridging the Rhine TWICE, organizing the invasions of Britain twice - but the descriptions of Alesia (which is just one of the great engineering-siege triumphs during Caesar's years in Gaul) seems to me to lead in a straight line to, say, the attack on Masada over a century and a quarter later. But did the Roman army continue to maintain its cutting edge in this military technology - or was Caesar's its "golden age"? I truly don't know - does anyone else?