It has been reported that the Emperor himself if leading the Bolitic attack fleet which is now just a couple of days away from Voth. The Bolitic attack fleet compromises the remnants of the front line of the Bolitic fleet and the entire Chosen Men who guard the Emperor. Borca knows that he must conquer the Voth if he is to save anything from the disasterous war against the Dinos and more importantly to prevent himself dying in an unfortunate accident with a sharp blade.
Conquering the Voth plus annexing the Vosun may be enough to placate the other major Barons who are beginning to prepare for a war of succession once Borca falls.