It is wonderful to see that a change of pace has helped you find your rhythm again. Writing nearly a thousand words in such a short window is a great way to build momentum toward your 100,000-word goal. Since you are wrapping up a chapter on the events of 1465, you might find that the specific political maneuvering between Louis XI and the rebellious nobles provides some great high-stakes inspiration for your final few pages. Keep that vacation energy going as long as you can.
That sounds like a wonderful breakthrough. Stepping away from the daily routine often gives the brain the space it needs to fully immerse in a creative world, especially one as rich and complex as 15th-century France. Hitting almost a thousand words after a dry spell is a huge win. Since you are deep into the 1465 conflict, this relaxed state of mind might be exactly what lets you visualize the political tensions of the noble houses so vividly right now. I hope the rest of your vacation brings you just as much focus and joy in your writing.