Well, the one about food is plain wrong for a well-managed, smaller, group. Although the big bands do have issues feeding themselves. The point about fire and roof over the head is correct, but then again: The Helots of our place had been unusually spoiled by the nice priestess (sorry, names and fancy Greek titles slip my mind at the moment) who was spending lots of money on providing adequate(ish) houses for them. Many, probably most, other Helots would be worse off in that department. Not saying that it is easy to live in the woods, but I consider it a clear improvement to what the poor sods had to deal with before.
Although, now that you mention it... How about building some semi-permanent houses for our rebels during the winter weeks? Cave dwellings or tree houses or something? Of course, you can't build a small stationary village because of the Theurges, but something in that manner should be doable. Might provide some help during the battle, minimize the need for mules to carry the sick. Better conditions for the ill bandits. In case you are looking for more work.