The Trem Clan of the Bothans had supported the Empire for many years, and even though the Empire had been forced to retreat from Bothan space with the advent of the Wrath Virus, their support had not waned. General Boone, under whose control fell the ISF and all their operations, knew this fact and planned to make use of it. Upon the orders of TNO High Command that Bothan Space once again become an Imperial possession, he immediately set the wheels of Bothan politics turning.
As he strode through the halls of the Imperial palace (a privilege, to be sure), he was already planning ways to contact the Bothan clans and prepare ground support for an Imperial attack. As it was, he didn't have to do very much.
I don't think you or Marth even realized this, but there is significant TRF canon involving the Bothans.
Why did I even get involved in this thread?
Because I was the former head of the Bothan faction at TRF.
DO SOME BLEEPING RESEARCH.
I have tried to correct inconsistencies (such as explaining away why not a single BOTHAN MADE VESSEL rose to defend the Bothan homewolrd) with my commentary... but this is ridiculous.
It make no sense for any Bothan clan to support the Empire. The Empire has never controled Bothawui (at least not to my knowledge) and they didn't retreat due to the Wraith Virus.
Search the battlegrounds and you might reflect the previously established canon... and not disregard the work I put in regarding the Bothans.
/end diatribe