Some bad Juju has infested the land, and the dead have come to life, threatening to overwhelm the Old World inhabited by Men, Dwarves, Halflings and others. The Emperor has hired your army, and at various times provides you with additional troops as well as gold for your troubles, to quash the undead and end the menace. Dark Omen is a real time strategy game. With archers, mages, cavalry and other units you battle ogres, orcs, skeletons and vampire lords. Units represent regiments of troops rather than single fighters as in Myth for example.
Damaged units lose troops until the the unit is destroyed.
The campaign consists of a large number of interconnected battles linked by voice briefings and cut scenes. In order to advance from one mission to the next you must generally win the battle. Defeat lets you advance as well, however your decimated army will be unlikely to be able to long survive as the battles get tougher. Your initial troops, consisting of one unit each of crossbowmen, cavalry, infantry and cannon are supplemented as the campaign progresses with additional troops. Some of these will stay with you permanently, others for only one or a few battles for specific objectives.