Draejon
Dear author, the phalanx should be only the middle line, I presume you know its weakness, they are not as deadly as many think they are. The Roman legionary should be used as well, its pila makes shieldwall completely useless according to many battle historian and the weak pinkskins use shields to a high degree, also orcs can throw objects further than pinkskins so they can be a second line infantry on top of guarding the sides of the phalanx. Maybe add some ballista, they are relatively small so they can be put on wagons with their ammo as well which can be the mentioned pila.