During reconnaissance in the Tau systems, I noticed several ships from the Bretonnian fleet.
Since I kept my distance from them and followed their route, I can say that there was at least one"Dunkirk"-class Battleship and they entered Tau-37.
After waiting a while and entering the Tau-37, I noticed many different ships, but the most interesting was the siege of the Fort Siloso station, owned by IMG.
Different ships from different factions came together to protect the station from the attacking forces outcast cartel and at the moment they are periodically able to force enemy to retreat.
Why ships of the Bretonnian fleet went there I could not find out.