I'm not saying that an attack would work - only that there could be 2 movers in it. 
tbh - like most others - I cannot see how Spulla are going to lose this one but like you say - HRE could get a tidy strike if they are lucky.
It will be interesting to see who the next target is for spulla and HRE. Spulla could walk through slaze - but they will be able to do that anytime. Not just now - HRE will be harder to crack - will it be easier in the industrial age or modern will be the only question.

tbh - like most others - I cannot see how Spulla are going to lose this one but like you say - HRE could get a tidy strike if they are lucky.
It will be interesting to see who the next target is for spulla and HRE. Spulla could walk through slaze - but they will be able to do that anytime. Not just now - HRE will be harder to crack - will it be easier in the industrial age or modern will be the only question.