re: Küstrin, I basically agree with Mildred that it doesn't really say anything about the first meeting, and since subsequent ones took place while Fritz was still living in Küstrin, I'd say that fact is quite enough for the story to be told that way. But I thought it was still interesting to get a 1744 view/version of Fredersdorf as another data point.

That was after the Marwitz letters in February/March that very same year

Ahaha, maybe he took Heinrich with him because he'd caught something from Marwitz after all. (Certainly would explain the "so he can marry" comment, if Fritz is speaking from his own - rumoured - experience.) :PP

But yeah, no wonder.