Not only does he fight for himself alongside some chosen companions, but also he has access to armies. Said armies are often made of different races and do have different units and ways of playing. See below which armies are available in each game.
See below a small overview about possible units within the first SpellForce series' armies.
The humans of the Highmark, the Morhir of Dun Mora and the dwarves of Underhall
The dark elves of Lar being allied with the shadows and their gargoyle servants.
The Iron Storm orcs led by the Iron Lord and barbarians and trolls
|The Shaikan (since SpellForce 2: Dragon Storm)|
Talented Shaikan fighters supported by Yasha Ashir's Blades and the dragons
Besides those armies there are also some armies which are hostile towards the Shaikan commanders.
An amalgamation various kinds of wild creatures and beasts.
Brought back from the soil these undead are dangerous to all living things.
|The Nameless (since SpellForce 2: Demons of the Past)|
An ancient tribe of demons that returned after th Shadow Wars to overthrow the world
These armies can be led into battle by Corporal Tahar.
The royal army of Nortander, the Wayfarers as well as some Iron Falcon soldiers
The Morhir of Lâthweyn in Leafshade deployed by the scryer council
Fighters and shamans of the Firewielder tribe of the Foot of Barga Gor