Something I've discovered during my Byzantine campaigns:
Byzantine guard archers are not your everyday archer corps: they're well-armored and good at melee fighting. Not the best infantry fighters, mind, but very serviceable nonetheless. They're not as lethal in ranged combat as English longbowmen, and they lack the punch of gunpowder units -- but with armor upgrades they can serve as Roman legionaries.
One of the Romans' great advantages in battle was the pilum, the javelin. Byzantine guard archers don't have javelins, of course, but they can start shooting from farther away, which compensates for the lower level of armor-piercing punch.
Thinking thus, I began to construct my Byzantine legions in the following manner:
10 Byzantine guard archers
5 Heavy infantry (Varangian guard for preference)
4 Heavy cavalry (Kataphractoi for preference)
Assorted specialists (General, Vardariotai, artillery, etc.)
Deployment is based on the manipular legion:
A = Archers
C = Cavalry
M = Melee infantry
CC AAAAA CC
AAAAA
MMMMM
Archers are ordered not to skirmish. As the enemy closes in, the arrows start to fall; it's not gunpowder, but ten stacks of archers can do a lot of damage, and the damage only increases as the enemy draws near. When melee fighting begins, fire-at-will mode is disabled; the front rank stands its ground and gives battle, while the second rank continues to rain arrows on whatever enemies are hanging around the edge of the fighting. As the front rank is depleted, the second rank steps into the breach. Should gaps appear in the line even after such reinforcement, the fully rested melee infantry (think Triarii) rush in and butcher the exhausted foe. Cavalry can be used to wither the flanks and rear with hammer-and-anvil style charges. When the enemy routs, melee infantry and cavalry withdraw and the archers form ranks, pouring more arrows into the backs of the fleeing foe. The long range and high ammo compliment of Byzantine guard archers lets them shine over their Roman forebears in this regard -- they can slaughter routers without breaking ranks, allowing them to instantly resume a defensive posture at need.
You don't have much to fear from massed cavalry charges into your archer contingent, by the by -- witness the Battle of Crecy. What you lack in English longbows can be made up by the sheer volume of archers at your disposal. The enemy cavalry have no choice but to charge your archers or die ignominiously under a storm of arrows -- thus pinning them to your archers, assuming they even survive the charge. Send in your own heavy cavalry to crush them from behind, and it'll be a slaughter.
Artillery are mainly useful because of their long striking distance. The enemy will have to engage at close quarters in order to avoid being taken apart piecemeal; but then they come within arrow range and the fit really hits the shan. Plant your cavalry to either side, forcing the foe into a long, narrow funnel -- your arrows will be maximally effective under such conditions. By the time they close for melee combat, they'll be in no condition to fight anything.
Summing up: Roman legions went out of style because of the battle of Adrianople, where massed cavalry broke the Romans' ranks and they didn't have anything like enough time to use their pila effectively against such targets -- fast-moving, lots of momentum. Guard archers can shoot from longer range, negating this cavalry advantage and bringing the Legion back into style. Roma vivo!
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