It was inspired by Accept's song "Metal Heart" that used Beethoven's "Für Elise" as the guitar solo.
The guitar solo in the song is Bach's "Air on the G String".
Also, in German instead of "Not a battle" which the band used, "No battle" ("Keine Schlacht") would be the correct form. It should be " Keine Schlacht, eine Rettungsaktion" since both Schlacht and Rettungsaktion are of female genus in German.
The song topic comes from the book "Endgame" by David Strafford which Joakim got from a fan.
The band was asked to make theme song for the Hearts of Iron game, but some time later they came across the story of Walter Wenck and it took a while to actually compose the right song for the topic.
The song title was inspired by a video game series "Hearts of Iron".