Warhammer 40,000: Dawn of War Winter Assault was made by Relic Entertainment and it was published by THQ. The game was released in September 23, 2005. Winter Assault is the first expansion for Dawn of War, it requires the base game.
Winter Assault added a new faction to the game, a new campaign, new maps and it made changes and balancing tweaks to different units
Winter Assault adds a new faction into the game, that faction is the Imperial Guard. The Imperial Guard is a faction that is focused on defense and wins a battle by overwhelming the enemy though sheer numbers.