It seems like it works best when you do it just before a charge and at close range. You can do it periodically during melee, but you seem to take casualties while you do (without inflicting any), but then you get a short term boost that inflicts casualties on the enemy quickly. Timed right you can do serious damage, but it is a double edged thing and can backfire.
The swordsmen appear to be reasonaly matched against the Romans, although the barbarian spear warband are badly outclassed. This makes some sense and so does the war cry effect. The Romans had trouble with getting defeated by well led "barbarians" whipped into a frenzy. The uniform discipline and nature of Roman units, and the flexibility it provided were assets. However, while disciplined and organized, they were not the most fearsome or powerful as individual units.
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