Garynth

The Garynths were a humanoid alien race of nomadic conquerors. They desired the data Biblios had collected on weapons and fought a war with the Vromyx to prevent them from getting it, refusing to believe the robot librarians' claims that there were no such records. The war lasted for 47.63 years until the Fourth Doctor arrived on Biblios and, learning of the situation, blew up an empty building and told both the warring sides that it contained the super-weapon data. The Garynths assumed that there was nothing left to fight over and departed. (DWM: War of the Words)