if your ship occupying a square next to an enemy planet, and the planet creates a ship and keeps it in orbit, that new enemy ship should take your ship out of sentry. this would greatly speed up the "exterminate" phase of the endgame.
there was a thread a while ago about orbital blockades and such.... not sure if this would have fit better in there or what....
hmmm.... this just popped into my mind:i haven't tried this with the guard command yet....
