I know this is a discipline where like half the professors still unironically recommend Fehrenbach, so "left wing military history" may be an oxymoron. But thoughts on left leaning military history books about the 20th century ?
Closest I've read is maybe The Blitzkrieg Legend by Karl-Heinz Frieser, which rips apart all the wehraboo bullshit and argues that the German army that conquered France was an ill-equipped bunch of incompetents who won in the Ardennes because of some well-timed cloudy days and some officers who went across the wrong bridge at the right time. But the author is a Bundeswehr colonel, so that's not exactly "of the left."
Dan Carlin has an episode (on his addendum podcast) about how the Nazis sucked compared with the Germans in WW1. But my impression is that military history/theory/whatever is generally pretty rightwing. Correct me if I’m wrong comrades.
I read BH Liddel-Hart’s book about Scipio Africanus and feel like a lot of military theory is in there as well, although obviously I’m far from an expert. Lawrence of Arabia’s book might also be useful although it meanders a ton and has sooooo much information about the kind of terrain you find in Arabia.
Interesting, will check those out.