Bret Devereaux

The good news is that unlike artillery shells or fuel, the countryside you are in already produces food, fodder, firewood and (f)water, so you can draw your supplies locally in the way that a modern army cannot. The bad news is that you usually have to do so. 4/21

So you need a playbook which can react to a wide variety of possible location conditions. If you have friendly communities, you can use requisition or purchase to get supplies. Btw, when you see 'general X opted to winter in <allied community>'... 5/21

...what's happening there is that he is making them feed and shelter his troops over the winter when foraging is difficult because the crops aren't grown yet in the fields. 6/21

This can work even in sparsely populated areas, if you can rely on local elites to gather up the food in advance of your arrival so you can roll in and pick it up without having to massively disperse the army. 7/21

If communities are unfriendly, you can do foraging - steal the food. Best done when the crops are ripe or nearly so in the fields. Wheat *plants* can't run away, but farmers carrying sacks of processed grain can - and they'll run into walled settlements you have to siege. 8/21

Taking fortified population centers can get you supplies, but only if you storm them - which is tricky. You need to be bigger enough than the settlement that you can just quickly build a ramp and roll on in, but not so much bigger that their stored food is trivial. 9/21

Finally, you have long distance transport, which basically only works if you are on a coast line with decent harbors, or a navigable river, *and* you have the coordination to get supplies from somewhere else moved to you in quantity. 10/21

And I do mean *quantity* - back of the envelope math suggests a single Roman legion (typically a sub-unit of a larger army) might consume 8.26 tons of food per day alone, which pops up above 10 tons when you account for fodder for animals. 11/21