It seems obvious to me that Herwegh has know the English song before penning his song. (Many English songs have been translated into German at that time, for instance "For all that"). However, I have not found any acknowledgement of that in online Herwegh texts.

A fine translation, Joe, except that 'Not' should not be 'danger'. It is rather 'hardship' or even 'poverty' that is knowcking at the door.

Wolfgang