I'm not saying that tactical blunders didn't factor in, but consider that it wasn't entirely unknown for Roman soldiers to take a camp or to fight against considerable odds. In Caesar's Gallic Wars, he mentions soldiers actually having to climb a steep incline in order to reach the enemy. I'm not saying that the Romans were invincible, though they at times certainly thought they were, and Valens had probably counted on the Romans to take the camp before the Gothic cavalry returned, something that wasn't going to happen, given that the Romans were already tired by the time they were facing fresh Goths. I'm not saying that there were not other reasons for the loss, I'm not trying to be difficult because I agree with you, I am merely suggesting that morale plays a significant, albiet subtle, role on the battlefield.
Greek Hoplites were specifically designed to be pushing matches, making them the exception to the rule. Furthermore, Macedonian phalanxes were designed to pin the enemy in place so that the cavalry could smash into their side and do the real damage. But when faced with Romans, at least at the battle of Cynoscephalae, Phillip V ordered his pezhetairoi to use their swords instead of their sarissas, indicating that Romans perhaps were not as vulnerable to the pinning/pushing motion of the phalanx as eastern soldiers might have been. This suggests at least some form of fluidity on the Roman's part.I doubt that this was really the way the fighting was done. First of all it would have been impossible to be done with a classical Greek phalanx, and most of the armies around the Mediterranian were based on the classical phalanx in one or the other way. Battles between these armies were more a "pushing match", according to what we know about it. It can also be excluded to be a kind of special Western European style of fighting (Celtic-Roman), because the Celts in particular were known to break if the first assault was not successfull.
And the image of Celts tiring easily and retreating quickly is a fallacy. Celts were tremendous warriors (later in the Empire's history, almost the entire army were composed of Gallic-Romans and Illyrians). The reason that Romans were more likely to win a prolonged conflict was because of the triplex acies system which constantly replenished fatigued troops with fresh soldiers from the reserves, while the Celts had no such system. However, there were many battles between Romans and Celts that were prolonged, such as the Battle of Bibracte during the Gallic wars, which according to Caesar started around noon and lasted until nightfall.
Does the undescribable horror of the melee which keeps the soldiers of both armies on the knifes edge of panic count for anything? It's not necessarily two sides tipping their hat to each other and walking away. battles were more fluid than that. It would have been simply breaks in the combat line where troops were having to muster their own courage to recommit to the fray. There were battles that were described as being a crush, when the soldiers of either side were being literally pressed up up against one another (which is why the Romans prefered the short sword, I'm not saying that they didn't exist!), which also suggests that because these battles were specifically mentioned for their intense melee (I forget which ancient writer's quote that is, I'll look it up later) a crushing pushing match may not necessarily have been the inevitable outcomeArmies in hand-to-hand combat seprating and reforming would also require some kind of "gentlemen agreement" that the party who had the upper hand would not pursue the enemy while he falls back and keeps up the fighting. Not to mention a very high degree of discipline, because soldiers that once started retreating can only be made to advandce again with severe difficulty - if at all.
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