Well, it happened like this you see. As you'll know if you have read Pete's battle report, Kev the rebel Ork Warboss has been making a bit of a nuisance of himself in the Galaxy of Damnation. One of his recent exploits was a battle over a dead world against Screech's Orks which came about because of rumours of an alien artifact on the planet (normally Kev would ignore dead worlds as being no fun at all).
Kev won and managed to find the artifact. He wasn't sure what it was at first, but he liked it anyway because it looked like a huge gun and had a big red button on it. He stashed it away on his secret rebel base for safe keeping and to give the Mekboyz time to figure out how it worked.
Meanwhile Gareth's Imperial Guard fleet was poking around in sector Gamma-Tertius and stumbled across the location of Kev's hidden base. He immediately attacked of course and prepared to cleanse the planet of the Orks. Early on in the Battle the Imperium noticed a lot of activity around part of the battlefield and ordered a unit to scout it out. They weren't sure what it was the Orks had there, but they knew that it looked important and proceeded to make a Take and Hold bid for it. It was Kev's alien artifact, of course.
The Mekboyz had by now worked out that the artifact was, indeed, some sort of very large gun. Kev decided that if da skumbag hummies looked like they were going so scrape an (unfair, cowardly) victory he would retire to the safety of his orbiting hulk and order da boyz to fire the alien gun at the Imperial pansies.
In fact the hummies (unfair, cowardly) pounding with ordnance combined with Gareth's (unfair, cowardly) dastardly accurate ranging meant that Kev's boyz got into trouble quite quickly. Kev prepared to make a strategic withdrawal and ordered three of his boyz to count to three and then press da big red button of the alien gun. This guaranteed him about 45 minutes to clear the area.
The alien gun was, in fact, a planet killer. Kev looked on in glee as a shock wave spread rapidly around the planet. It then imploded on itself in a blinding flash of light, and the whole Ork fleet began to accelerate toward the (former) location of the planet at a vast rate. Being a planet killer device the wisest way to use it would have been from a very great distance...
Where the planet once was there was now an unstable warp hole. Kev and his entire Orky fleet joined his Imperial adversaries in the journey of a lifetime. The warp hole sucked in both fleets and spewed them out again at a random location elsewhere in the Galaxy of Damnation. Once his head had stopped spinning Kev took a look around this new part of the Galaxy and set off in search of further mischief. OK, so he had lost all of his stash but the skumbag Imperium hadn't got their hands on it either. In fact it was a bit of a relief. He could stop skulking around on a secret base and get back to shootin' and maimin' at random. Waaaagh!