I don't know the song Frischauf, ihr Preußen ..., but it seems to me by the structure of the song that it might be the tune of a better known song: Was blasen die Trompeten? Husaren heraus! (What are the bugles calling? Hussars come out! = A song to the praise of Field Marshal Blücher.) Especially the chori (chorusses? chorussians?) fit together.
It is not uncommon in German soldier songs, that one tune is used for a couple of different songs, modeled after a common source.
And now, Wolfgang, where the hell did you find the song? Source, please.
6. Fuß ... Must it not be Füß? (rhyme to Paris, adj. meine = pl. fem.)

Wilfried.