Just sent a fleet of destroyers to attack an outpost, and it showed the combat animation for a short period of time. When I checked back in the system, all my fleet has disappeared, and the outpost is still there. Ships are also gone from the ship menu. I assume they've been destroyed, but I got no notification about the results of the combat or anything. Are these not active? If they are not, how do I know what happened?

Thanks,
ThoonHulk