And then the mace they attached to the crane came down and brained the drive, causing the Ork wartruck to go out of control and smash itself into an exposed engine at the back of an Ork gargant that also happened to serve as the Ork Warboss's mobile HQ. The ensuring explosion so large it not only killed the warboss, but also his nearest Nobz and many Ork boyz of the WAAAGH within a two mile radius, while those that remained fell into infighting afterwards.The Imperials defending the world the Orks invading never bothered to ask what the **** happened since then.