Indeed. I have this Quarto edition [1] of his war-related writings on the small table that sits in the middle of my living-room, I have gone about one third through it, and I have to say that seeing photos of him in WW1 trenches is indeed very much "walking the talk". I don't expect many (if any) of today's intellectuals to do the same if it were to come to men fighting in the trenches again.
[1] https://www.fnac.com/a1723295/Marc-Bloch-L-Histoire-la-Guerr...