One of the most fascinating aspects of the Battle of the Teutoburg Forest is the way that Arminius was co-opted as the poster boy for German nationalism. The Landesmuseum in Detmold had an exhibition last year called "Arminius, Thusnelda und die Schlacht im Teutoburger Wald". Pretty successful both artistically and financially, it has allowed the museum to buy a couple of new paintings.
Franz Schröder's "Schlacht im Teutoburger Wald" and Ludwig Fahrenkrog's "Germania es kommt dein Tag" are both worth a look. The latter especially, painted just after World War I is a fantastic example. Germany is in chains kneeling in front of a saint-like Arminius. It is deliberately reminiscent of saints being visited by a vision of Christ.
Both pictures can be seen in Lz.de.