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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, without a single Ork slipping by him{{Fn|1}}{{Fn|2}}{{Fn|3}}. Regrouping with his forces, the Ultramarines counterattacked and smashed the Ork forces on the planet.{{Fn|1}}