This was posted a long time ago I'm not sure if anyone noted it but fenir I believe you mentioned that the invention of the stirrup helped the original advent of heavy cavalry. If you look around I believe you will find that this has been disproven by multiple people, it is actually very feasible to get an effective charge without a stirrup, the stirrup was actually supposed to help horse archery much more, as it allowed the rider to balance himself better while shooting.
The Companion Cavalry of Alexander, regarded by some as the best cavalry of all time, would have operated without the stirrup and they still proved remarkably effective.
As to an explanation to why barbarians began using cavalry extensively around the end of the roman period, I'm afraid I can't give you a sure answer. One would be the invention of the saddle (though I'm not sure when this was) in addition to the Roman Empire disentigrating from within, the legionairries that faced the Goths at Adrianople were far different from the ones centuries earlier and would have been much poorer in quality.
On topic: Swordsmen most certainly would have been useful in many situations, but the reason for their lack of use is more likely due to practicality than anything else. Why did inaccurate, dangerous and impotent guns replace the bow at such an early time period? With the gun it was much easier to use it to get effectiveness out of un-trained peasant levies than to train bowmen. Men could be armed with it more easily and still be effective, because you would have more men to shoot something at the enemy. With a spear, it is far easier to point and say "Point your spear that way" than to actually have to train someone for weeks in the use and finesse of a sword. To have a swordsman in your army costed money, and when it comes to money most people tend to get real stingy.
Another reason, and probably the more important one, is a tight well-trained unit would be much more effective than a unit of swordsmen.
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Obviously, the legion is an exception, but the legion was something born out of need. All areas around Greece had prior to Alexander the Great used armies which were light and quick. The staple of these armies, would often be the elite, the heavy cavalry or infantry. The Greeks first destroyed these armies on their own turf, destroying them in confined areas where mobility was of no use and then Alexander went off and destroyed them on battlefields where mobility could be used, but with one of the greatest armies of all time. As a result the areas around Greece adopted the phalanx, but they could not support it properly, as Alexander the Great did. The men trained for the phalanx were not as well trained, the cavalry wasn't as skilled or experienced, and the generals were not as skilled.
The Roman legion was developed to take advantage of this, even barbarians in Gaul and Germany used tightly packed units of spearmen with little or no outside support. The legion was much more flexible than the phalanx and could take a much better advantage of any terrain and out-flank, out-maneuver, and out-perform anything any nation outside Rome put up against it, provided it was led by an able general. Adrianople is an example of a slow but slow return to the armies of Alexander the Great, a massive unit of spearmen supported by heavy cavalry. While the knights of the Middle Ages might not have been as skilled as Alexander's Companions, the new armor of the age and the sheer mass of all their equipment made up for it on the battleground.
Thanks to those of you who read my rant, most of it is philosphical, you can make your points and try to correct if you will...
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