In theory it should be pretty easy to track a fleet big enough to wipe out four heavy cruisers and their escorts without losing any of their own ships but that doesn't seem to be the case. The buoy network should be able to point you in the right direction but the rudimentary nature of the buoys mean all of the reports from them have to be sent to Cartha and then sent back to you out on patrol. This not only means you get outdated info but also a lot of false positives in the form of small enemy patrols, enemy convoys and now the occasional friendly patrol or spook ship testing the very permeable front line. You do eventually find something to attack instead of the fleet that destroyed the patrol, its a decent sized convoy of enemy transports escorted by a fleet of 8 battlecruisers 16 heavy cruisers and 30 of the rare enemy corvettes. They are in a barren star system doing some sort of maintenance task when you jump in through the systems lone jump point.

>Wait for them to come to you
>Attack
>Write in