Q'ell was a planet where a centuries-long war was fought.
The Recruiter, damaged by a plasma bolt, landed on Q'ell fourteen hundred local years before 1919. It could not repair itself, so it used the psychic powers of the native Q'ell to locate other species to use as soldiers to fight a false war, then teleport them to Q'ell. It theorised that war caused technological advancement, and eventually would create the necessary technology to repair it. This never happened, however, and millions died in the war. The Seventh Doctor was able to reprogram the Recruiter, freeing the natives and the brainwashed soldiers, whom he returned to their homeworlds. (PROSE: Toy Soldiers)