The best of your fleet with some militia recruits goes against the AI Planet's never ending fleet. How long can you last? You get to keep all the scrap you can get. This is a really cool mode where you do a 50 vs 50 space ship battle with reinforcements.
When leaderboards come out, there will be three leaderboards:
1) Raid ELO
2) Base ELO
3) Most Scrap Collected in one Last Stand
Since it is such a valuable trove of scrap, you can do Last Stand only once every four hours for now.
,Jim