And an early Eldar mission involves destroying a series of Ork towers spread far across the map, all under the constant threat of enemy convoys. They spend the mission charging it up and defending it, firing it, and then repeating until they can get the weapon back to their base.
In one, the Orks have a gigantic cannon that flies across the battlefield whenever it's fired. The mission design is generally quite engaging. The multiple perspectives make for an interesting story as you see how the sides encounter and bump against each other, with the Orks providing a humorous contrast to their overly serious counterparts.
Although Dawn of War III is more of a traditional RTS than the last game, the campaign is still quite strong.