Read more about Sisters of Battle at: Wikipedia

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In the fictional universe of Warhammer 40,000, the Sisters of Battle, also known as the Adepta Sororitas, are female warriors belonging to the "Ecclesiarchy", the religious arm of the Imperial government. The Sisters devotedly serve the Emperor of Mankind. They enforce the Imperial religion, seeking out and destroying heretics that defy the Emperor's Will.

They were officially founded in 36th Millennium by the Ecclesiarch Alexis XXII as Ordes Militant. In the 2nd edition of the game they were a standalone army, but, like the Grey Knights, the 3rd edition codices saw them joined to an Inquisitorial force. They now comprise the Chamber Militant of the Ordo Hereticus, "Witch Hunters", which is tasked with hunting down and destroying heretics and unsanctioned psychics (commonly known as "rogue psykers" or "witches"). As such, the Sisters are found within the army book Codex: Witch Hunters.

The Sisters of Battle are also a playable race in the Dawn of War real-time strategy game, as part of the Soulstorm expansion.

Though not the same as the Space Marines, they do wear similar power armor and have the same general unit set-up. Their weapons tend to be heat- and flame-based, because of the 'purifying' effect of fire, inspired mainly by the popular portrayal of the Emperor as a cleansing fire. This creates an interesting situation as the sororitas lean towards two extremes of weapon types: melta weapons for anti-tank and flame weapons for anti-infantry, both being heat based weapons.

Sisters of Battle has not been a contender in any CBUB matches.