Create a new story event around the idea of the fall of Reutlingen funding the hessian war effort:
Such that the raw materials seized from Reutlingen's wreckage (Ores etc), provided a boost to the hessian economy. Allowing the hessians to expand their cap fleet and take full control of Dresden and then invade the southern part of New Berlin.
Story Event: Part I
Would see a final battle between the crippling Rheinland Fleet and the Hessian Fleets for complete ownership of Dresden. A hessian win ensuring full lawful presence removed from the system, NPC Bases and all.
Story Event: Part II
Dependent on a hessian win in the first event, would see the over-confident hessian fleet attempt to push into New Berlin via Dresden, invading the southern sectors and destroying the Rheinland battleship parked at Brandenburg if the hessians win the second event. Else they would be pushed back to Dresden.
There a potential new war front could open up right on Rheinlands doorstep, lore written in outcomes of story events. Hessians and Rheinland could have a fresh front to log in to in NB.