The need for more supply wagons/trains/routes as a drawback to armies makes good sense. However, for combat purposes armies are far superior to single units.
Armies of Alexander the Great consisted of, among others: the (superior to hoplites) Sarissophoroi (melee unit), spear throwing Peltasts (ranged) and famed Companions (mounted unit).
When encountering enemy such an army gives the player an opportunity to range attack/defend, melee fight/hold the enemy while flanking them with the mounted unit all in the same turn.
Persian armies were full of archers, immortals, chariots, horsemen, spearmen... All combined unit types, not only melee, or ranged. Employing armies offers great chances for strategizing and engaging combat!
Of course there would have to be rules of how many units can an army carry, it could depend on your Government type (assuming these are part of the game), social policies of your choice, your tech level, UA's of your tribe and the availability of Great Generals, or creating additional officer ranks to the game, meaning a captain can lead an army of 2 units only while a general of 4 or five.
Armies of Alexander the Great consisted of, among others: the (superior to hoplites) Sarissophoroi (melee unit), spear throwing Peltasts (ranged) and famed Companions (mounted unit).
When encountering enemy such an army gives the player an opportunity to range attack/defend, melee fight/hold the enemy while flanking them with the mounted unit all in the same turn.
Persian armies were full of archers, immortals, chariots, horsemen, spearmen... All combined unit types, not only melee, or ranged. Employing armies offers great chances for strategizing and engaging combat!
Of course there would have to be rules of how many units can an army carry, it could depend on your Government type (assuming these are part of the game), social policies of your choice, your tech level, UA's of your tribe and the availability of Great Generals, or creating additional officer ranks to the game, meaning a captain can lead an army of 2 units only while a general of 4 or five.