Infantry (I)
Cavalry (C)
Archers (A)
Mages (M)
Support (S)
Heavy Spearguard, which have high defense
Maulers, which deals heavy damage to enemies in a column
Berserkers, which deals heavy damage to a single target
Marauders, which attacks the enemy from behind
Etc
The details about these troop types can be viewed here>>. Troop types, along with the specific ability of a general, makes every general unique in this game.