Besides that it's hard to find many decisive "moments" where warfare changed forever thanks to one man's brilliance. For example, Adrianople is often exaggerated as the "birth of heavy cavalry" but both the Romans and barbarians had been making steadily greater use of armored cavalry arms for a century and a half beforehand. In general, gradual change was the norm and famous battles just serve as exemplars rather than change agents in and of themselves.

That said, Marius reforming the organization and recruitment system of the Roman legions had serious political effects that undermined the republic.

(http://www.autoadmit.com/thread.php?thread_id=3981972&forum_id=2#36089764)