The liberation of Vianden was the final battle over the planet during the Yuuzhan Vong War. The planet was conquered by the Yuuzhan Vong during the early stages of the Yuuzhan Vong War in 26 ABY. Forces of the TaxCom Skirmish Force were forced into a hasty retreat while the organization itself was reformed and forced to cooperate with the invaders.
An assembly of Imperial, Alliance and freelance forces struck at the planet, and after a three-week long siege finally had rooted out the Yuuzhan Vong garrison forces, under command of commander Christopher Maraisell, the only human to command Yuuzhan Vong forces. Christopher was killed at the end of the battle when the Crusader was destroyed.