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The '''Siege of Zalathras''' was an engagement by the [[Ultramarines]] 2nd Company under [[Marneus Calgar]] himself against [[Ork]] forces under [[Warboss]] [[Brug]]. Occurring in 797.[[M41]], Brug's forces laid siege to the world but were unable to pass the city gates, which Calgar held by himself for a day and a night. Regrouping with his forces, the Ultramarines counterattacked and smashed the Ork forces on the planet.{{Enfn|1}}