[1]: https://www.thestar.com/news/insight/when-u-s-air-force-disc...
[1]: https://www.thestar.com/news/insight/when-u-s-air-force-disc...
He's done other blog series in the past that are more specific about specific things. His best work is on ancient military tactics and strategy. Every now and then he does these "baseline knowledge/understanding" series when he gets fed up with a particular group of idiots in his comments. It's like a teacher getting a class and being like "oh, you really are this dumb, I guess I gotta teach prerequisites before we dive in" even if they're not the best person to teach those prerequisites.
Yet, I don't know if that pertains to peasantry as they didn't have much of a choice depending where they lived. The article talks about Europe as if it was somewhat homogeneous (and mostly divided west & east)