They would later be made into the featured playable race in the first expansion pack, Winter Assault.

Limited numbers of Imperial Guard units can be controlled in the Space Marines campaign. Lacking the superhuman resilience and fighting prowess of the Space Marines, Imperial Guardsmen are forced to rely on numbers, ranged weaponry, and tanks. In addition to the four fully playable races, the Imperial Guard also make appearances in the single player campaign as allies of the Space Marines, led by Colonel Brom. Several clans are featured in the campaign, as is the hulking Ork Warboss, Orkamungus. The tech tree for Orks differs from the other races in that it depends on the amount of Orks currently in the army and the number of erected WAAAGH!! banners. In large enough numbers, they gain morale immunity. While generally lacking in sophisticated technology, they are physically powerful, using brute force and crude weapons that well complement their tendency to attack in massive hordes.

The Orks are a savage, brutal and warlike species who exist to seek the thrilling challenge of battle.

The campaign features a warhost hailing from the craftworld Biel-Tan, led by Farseer Macha.

Swift both on foot and in their hovering grav-vehicles, they are also able to move quickly around the map via webway gates. Eldar in Dawn of War are fast and agile but most of their units are more fragile. The Eldar are a sophisticated psychic race, ancient and technologically advanced, that have fought the fell powers of Chaos for millions of years before mankind's birth.The campaign features the Alpha Legion, with their leaders, Sindri Myr and Lord Bale. In addition, they employ morale-draining daemons and psykers. In Dawn of War, they use troops that are corrupted mirrors of their loyal Imperial counterparts. The Chaos Space Marines are traitors that, ten thousand years ago, chose to abandon their duties to humanity, betray the Immortal Emperor of Mankind and the Imperium, and instead worship the Gods of Chaos, accepting promises of power and immortality.The Space Marines are the only playable race in the single player section of the game, and the 11-mission campaign features the 3rd Company of the Blood Ravens chapter as the protagonists, led by Captain Gabriel Angelos and Librarian Isador Akios. Their troops and vehicles are more expensive, however, reflecting their limited numbers. Space Marines have the highest morale in the game. Inducted at a young age, each Space Marine receives biological modifications, a lifetime of rigorous training, and lives to experience centuries of endless battle in the defense of humanity. Space Marines are the elite, highly skilled and genetically modified superhuman soldiers of the Imperium.Warhammer 40,000: Dawn of War features four playable armies: Main articles: Space Marines (Warhammer 40,000) Chaos Space Marines Eldar (Warhammer 40,000) and Ork (Warhammer 40,000)

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