The Imperium has settled a necron tomb world, and the necrons are waking up as the orks invade. It can be surmised that the necron lord, having his forces waking in sequence, determined to use the orks to soften the Imperial forces. In a reconnaisance-in-force, a Crimson Fist and Mechanicus force engaged necron and ork forces that saw the Imperial and ork forces mauled. A follow-up strike against the necrons by White Scars and Blood Angels forces was hammered and roughly handled.

The orks and necrons then "united" (or the necrons lured the orks and followed them in) to assault an Imperial city. In a massive battle [17,000pts a side], the combined xenos forces smashed the Imperial defenders, though the White Scars and Astra Militarum were able to permit a fighting withdrawal [in reality, at the end of the second/final day, the Imperial forces had a 2VP lead, but it was clear if we could have gone on even one more turn we would be losing badly, so while, RAW, the Imperium won the Apocalypse game, in reality we recognized our imminent loss].

The Imperium launched a lightning raid against an ork Stompa factory, and though much damage was done, nonetheless the orks held on. Meanwhile, the orks and necrons had a falling out, though it didn't matter much as the necrons beat the orks handily. Now, the White Scars are going to try and delay the pursuing necrons forces.