Nope, supplies can be purchased locally or pillaged at least up until about 100+ years ago when it becomes more arguable because of different specs for munitions etc. Alexander made good progress in Persia because he had supply agents going out and buying supplies for the troops. Greece and Macedon didn't supply them. An army with lots of gold before the rise of nationalism could probably buy all the food it needed from the locals. Mongols were even better, all they need is enough grass for the strings of horses and they could go as far as they wanted. Took forests or mountains to slow them down
For modern warfare what you say is pretty much the case, no supplies from home or an ally and modern units get pretty useless pretty fast.
For modern warfare what you say is pretty much the case, no supplies from home or an ally and modern units get pretty useless pretty fast.
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