6. Imperial Army
The Imperial Army, or today: Astra Militarum, is a classic “mass over class” faction. You flood the battlefield with a multitude of units, some of which you even kill yourself to keep morale up.
In the game, the Imperial Army relies on a balanced mix of infantry and vehicles, making it difficult for many other factions to deal with them due to their sheer numbers. You can literally overrun some enemies.
Similar to the Space Marines, the strength of the Imperial Army lies in the late game. The Baneblade, the relic unit of the Imperium, is the strongest unit in the entire game – and correspondingly expensive.
Your biggest problem as the Imperial Army is that you first need to get there. The beginning of the Imperial Army is comparatively weak, but through a flood of cheap soldiers, you can generally hold out quite well until you advance far enough in technology to strike back. The story behind the faction is also exciting: Everyone fights in Warhammer 40,000 for the Imperium of Man – What is it actually?