Still Not as Good as 'Batmania', Of Course

Found this WW1 Propaganda poster:



I must say, it's not very effective to my eye. I can't imagine being inspired to fight to stop Melbourne being renamed "Zeppelinburg"; quite the opposite. "Kaisermania" sounds like an improvement too!

Not quite sure what "Bernhardburg" was referencing in a WW1 context. Any ideas?