Due to an unexpected attack of the believed extinct separatist union, the Great Republic is desperate to call its expeditionary forces, to return home and defend the Republic, as it is believed that the CIS remnant has a superweapon, whose codename is "Death Star"
(What does this mean? Well, that the Republic will no longer fight in the UG-Thrawn war, besides leaving the cosmoteer universe, maybe one day it will return, but for now, a great evil is approaching ...)