Someone once summarized The Art of War by Sun Tzu as "remember to feed your army" and honestly, they're right. We act like it's some kind of semi-religious text from the Mystical East but it's a lot of practical advice along the lines of, "if your soldiers look weak and exhausted and they keep leaning on their weapons they are not getting enough food."
Anyway. I keep thinking about this kind of Obvious Advice because um. My greatest takeaway from David Clammer's book Ladies, Wives and Women: British Army Wives in the Revolutionary and Napoleonic Wars 1793-1815 is that Napoleonic Wars soldiers were not sleeping in tents??! There was a high-level decision to NOT USE TENTS, in the interest of greater mobility (and concealing the size of your force), right up until 1810 or so. The British did it, Napoleon did it too. Guys, should we be feeding the soldiers AND preventing them from dying from exposure? Tough call...
At least in the War of 1812, if you didn't have tents it meant something went very wrong (baggage never arrived, roads are impassible, etc.)