Oceanaron

Oceanaron was the sea moon of Kelados. It was there that a low-level chemical weapon bombing raid transformed the planetoid's oceans into highly corrosive acid, thus destroying the flotilla of Torpedo Daleks who had not-so-cunningly disguised themselves as rather large floating mounds of Dalek-shaped Keladon gull dung. The Dalek Survival Guide counted this as the greatest defeat incurred by Special Weapons Daleks. (PROSE: Dalek Survival Guide)