while you are waiting for an answer, here's an earlier one by u/mrleopards:

I often here that the Byzantine army was the best in the world at many points in its history, why was it unable to have the same level of success in conquering large swaths of territory that their ancient counterparts did?

answered by u/hatmaster12:

How similar was Justinian's army to that of an old roman army?

as-yet unanswered recent question by u/rusticbohemian:

Byzantine Roman troops frequently panicked and ran from battle. Yet Byzantine Romans are considered by historians to have been the only western state to have maintained the Roman's highly organized and trained approach to war. How should we reconcile these two ideas?

tagging u/steven_Aemilius, u/AidenMetallist, and u/alekzander01 who also asked questions that went unanswered