Summoning the Terran Federation

Humanity in the 23st century has experienced not just WW3 but also the intergalactic war with the most advanced representatives (The Ravernal Empire)(Ravernal were almost superior in technology against the UN ) (but which have only colonized their planetary system ) of the Andromeda galaxy .As a least resort, The UN used their superior experimental space propulsion tech to send an asteroid towards them but change its path so it just passes by then the Ravernals rush into the Time-Space Void for their survival.
Now in the 31st century, now that the UN changed its name to the Terran Federation after massive changes to its society and have reached even the further corners of both the galaxies with its scientific practices of warp drives and research almost finished for hyperspace. They look back at the world of the winged people and see some activities. Thus a part of their Military Space Force is sent to investigate the planetary system of their old nemesis.