I often listened to Ernst Busch. Contrary to Roth he truly said what he sang: Workers's songs, Spanish revolutionary war, communist agitation. His emphasisi is not so bad as Roth's in my humble opinion. But that is a question of style and gusto.

Original version of the song Wolfgang gave:

Auf, auf zum Kampf, zum Kampf,
On ward to batttle
Zum Kampf sind wir bereit.
for battle we are ready
Dem Kaiser Wilhelm haben wir's geschworen,
we have vowed it to Emperor Wilhelm
Dem Kronprinz Friedrich reichen wir die Hand.
we shake hands with Crown Prince Friedrich

Since most of the Rotfront and SA had served in WWI, we find a lot of soldiers' songs changed to the political views of the conflictive party organizations.

Als Adam grub und Eva spann
When one uses one stanza with six others self made I should not speak of reworking an old song, but of using a small part of it.
When Adam delved and Eve span, pray, who was then the nobleman? stems from the time of the English peasant uprising of Wat Tyler 1381.
I just cannot find the song now, but I first saw it in the German translation of a Chartist song which was sung for a time in Germany, too.
More about des Geyers schwarzer Haufen.