You only have one of those chapters? Lucky!

For me, facing such a passage can be relatively overwhelming, and it doesn't help that during such times, memory can be fragmented and disjointed, adding yet another hurdle to the process.

That said, my first question is whether the words aren't coming or something else is blocking you that you're interpreting as words because that's the end result. I'm not so much looking for you to answer that question here, but rather to spend some time for yourself determining whether you've correctly ascertained the root cause(s). More than once, I've gotten stuck and gone off on a useless excursion for lack of considering the actual problem being faced.

I have only two suggestions:

• Distill the chapter into a single sentence with at most two dependent clauses. There's obviously an inciting event, but that may be a red herring when figuring out what the chapter is for in the larger narrative. Ultimately, it needs to advance the story, and determining how that occurs (later themes that become at least incipient at this juncture are good threads to pull on) can bring the structure and flow into sharper focus.

• Immerse yourself in what you can from that era. Music is going to be easiest; depending on how far you're looking back, little else such as landmarks may be left. If you were writing at the time (either journaling or personal communication), that's obviously going to be a more reliable form of memory than viewing things from across decades -- and you can't plagiarize yourself, so don't shy away from your own primary sources.