After war is declared by either party, the FE should attack the bait planet which you have fortified like crazy. In my case, the FE had 2 fleets. The first (bigger one) was sent to the planet along with armies to capture it and the second fleet [url=https://stellarischeats.co/]stellaris
cheats[/url] was holding back protecting the colossus in a nearby system. As soon as the bigger fleet started bombarding the planet, I jumped on them from the gateway and shred the fleet along with the transports. Then I moved out of the gateway back into the other end of the gateway (which the FE cannot access).