But “der Schweiz” is also correct in German: it means “of Switzerland”, so is more-or-less correct in the context of “the citizens of der Schweiz”, given the mingling there of English and German.
Apparently so. He was using paraffin as a moderator, and vying with the luftwaffe for radium.
A victrious Nazi Germany need not have invaded Switzerland. The destruction of a few key railway tunnels and a focused policy of starving Switzerland of any imported goods woul have readjusted the Swiss attitude fairly quickly and with few German casualties.
The Germans got nowhere-they never had a sustained chain reaction-so they could never make plutonium. Their “reactor” was a laugh (blocks of uranium strung on chains, lowered into a vat of heavy water). Had it gone critical, it would have killed everybody in the building. They were never even close to a bomb.
The top Nazi leaders didn’t really want to conquer Switzerland – they all had their secret numbered bank accounts there, and didn’t want the German Tax people looking into that.