There are multiple regiments in the Army of Stormwind.
Regular forces are standard warriors of the Kingdom. Their knights are sound fighters; however, the main strength of this subfaction is magic. Wizards of Stormwind are the best in the whole army and capable of summoning mysterious creatures. Their clerics can heal wounds and make things invisible.
Scout Corps are a special regiment of the Stormwind army. Its soldiers are weaker, but faster, for mobility is the key to their victory. But the main force of the scout corps are rangers. They specialize on fast and devastating range attacks and have far more upgrades in their disposal than their colleagues from the regular army. There are clerics in the scout corps. But they’re not that effective, as their brethren from the regular troops.
Another feature of this Corps are thieves, which can infiltrate enemy buildings in order to steal resources or technologies.
The strongest and most advanced part of the army is the
Engineer Corps. They rely on armor, enchanted weaponry and technologies. They have the best defense (including Cannon Towers) and shooters. They also possess two kinds of artillery: regular Ballistas and Siege Cannons, which damage can be upgraded. They harvest Gold not from regular gold mines but from ore deposits by building Refineries. There are no wizards and conjurers in the Engineer Corps.