I was watching a video on Rome and how good their army was how ever the video was more talking about what Romes military actually accomplished rather than strategy
There may be direct replies to this question, but there are some existing replies that may also interest you:
Were the ancient Roman armies more effective than medieval armies, or would they have not stood a chance? by u/toldinstone
What are some examples of Roman infantry tactics being countered effectively? by u/Celebreth
and
How did Roman military tactics and army organization differ in the 4th and 5th centuries when compared to the 1st and 2nd centuries? also by u/Celebreth