After learning that Bothan spies had supplied the traitorous Moff Kalast with the information about the Death Star he passed on to the Rebellion, Emperor Palpatine resolved to punish the Bothans for their treachery himself.
Upon landing on Bothawui, Bothan officers greeted the Emperor, and were all slaughtered by the Dark Lord's Force lightning. The Sith and his Royal Guard unit proceeded into the city, where Palpatine brainwashed a number of Bothans with Force corrupt, and proceeded to destroy Bothan assets.
The Bothans's punishment.
In the end, all the corrupted Bothans were turned on and killed. One Bothan, fearing for his life, told Palpatine that the Death Star plans were going to be beamed to the corvette Tantive IV, in the Tatoo system.
Palpatine regrouped with Darth Vader, who had learned the same thing during the raid on Polis Massa. Vader gathered his forces and moved the fleet to Tatooine.
This battle was the eleventh mission of the Imperial campaign in the 2006 video game Star Wars: Empire at War.