No, there is a very clear difference between warfare in the classical and medieval eras (in the West), and it dovetails with the collapse of large-scale politic

No, there is a very clear difference between warfare in the classical and medieval eras (in the West), and it dovetails with the collapse of large-scale political authority and the ability to muster large armies. Another distinguishing factor is the widespread building of castles. During the classical era, fortifications were less useful because there were powerful states that could capture them anyway. But when even the nominal king or emperor had trouble mustering a force of fifty thousand men, the castle vs. the siege (and the raid) dominated most warfare. During the classical area many of those same places would have been sparsely populated, and certainly not well fortified.