Although there is actually a scenario called Nazi Smatzi, we're not concerned with that one here; its turn will come at a later date. Instead we have three one-map scenarios for the First Encounter. To wit:
Nazi Annihilation by an unknown author wherein you annihilate some Nazis (amazing, I know). It's a decent map, but the overall symmetry might offend some people.
In Nazi Arena by Jay888, you're forced to fight in the titular arena, completely surrounded by SS (who may not always react immediately to your presence because of the distances involved), then a smaller arena with a different set of enemies.
And Nazi Challenge by Kendall Kiyohara is a very compact maps with tons of secret pushwalls and perhaps more dogs than usual.