I just finished a "pacifist conquerer" style game where I won a military victory without firing a shot or invading a single world (Influence victory was set to off so I could do this).
At one point mid/late game, an invasion screen came up showing the Arceans trying to invade one of my worlds, which was strange because I wasn't at war with anyone. They killed a few billion troops but lost. After the battle I pulled up the diplomacy screen and we weren't at war-- our relations were "warm." The only lingering evidence of the battle was in the final victory summary in showed my troops killed/lost in battle.
This was in Beta 4. Anyone else ever seen this?
