If you are interested in combat decision making, then I’d recommend Brains and Bullets by Mackay(?) and The Stress of Battle by Rowlands. These are both more about operations research and how stress affects unit performance in battle, but they give interesting tactical insights too. As noted above, keeping it simple is best.
I generally find WW2 training manuals are less dry and more intuitive than modern ones as they are aimed at mass conscript armies, and they cover drills very well. Chris Sharp has translated the Russian one, Nafziger has the1942 German one (German squad tactics? but it goes up to company level) and the British Infantry Field raft and Tactics 1944 has been endlessly reproduced. See egThe British Army Handbook 1939-45. Everything you ever wanted to know about how to clear a wood, take a village, deal with a pillbox or walk safely down a road.
"Mistakes in the initial deployment cannot be rectified" - Helmuth von Moltke