How do I attack a raider?
In my current game, one alien race has sent a raider into my space to prey on freighters of another alien race with whom they are at war. The raider has already destroyed several of their enemy's ships, costing my alliance in trade income. I have converged a couple of fleets on the raider totalling 10 warships, so I have plenty of firepower to destroy the raider. However, I am unable to attack for whatever reason. I set an Attack rally point on the raider, but whether I give the orders for Auto Attack or Sentry, my fleets won't do anything but just sit there and watch the raider continue its mission. The only treaty available to me for the raider's race is Surrender -- which would be profoundly embarassing with a 10-to-1 advantage! How do I get my fleets to attack and destroy the raider?