Greek units
Hoplites are the basic Greek infantry unit. They are very tough
compared to other infantry, but also fairly slow. Hoplites are good
against cavalry and other melee units.
Toxotes are the basic greek ranged unit. They are good against infantry.
Hippikons are the basic Greek cavalry unit. They are fast and
very tough, but also expensive. Hippikons are good against
archers.
The Hypaspist is the Greek infantry counter. It is very powerful
against other infantry, but nothing else.
The Peltast is the Greek archer counter. It is long ranged, and
very powerful against other archers, but nothing else. Peltasts
are also useful against Throwing Axemen, but not so much so as
against archers.
The Prodromos is Greek cavalry counter. It is fast and fairly tough,
and very powerful against cavalry, but nothing else.
Unique to Zeus. The Myrmidon is an elite Greek infantry unit with a
bonus against all Norse and Egyptian units. Like regular infantry, it
is best used against cavalry and other melee units.
Unique to Poseidon. The Hetairoi is a cavalry unit that does
additional damage to buildings. Like regular cavalry, it is also
effective against archers and siege weapons.
Unique to Hades. The Gastraphetes is a very long ranged archer.
Like regular archers, it is good against infantry, but its unique
attribute is its strength against buildings, making it something of a siege weapon.
Unlike the Norse and Egyptians, who have only a melee siege
weapon in the Heroic age, the Greeks have the long ranged
Petrobolos. However, the Petrebolos - while longer ranged - is
inferior in its ability to bring down buildings.
The Helepolis is the most powerful siege weapon in the game, both
in terms of how much damage it can take, and how much damage
it dishes out. However, it is slow, short ranged and expensive.