 You could go hunt. Yeah, you might be short of fresh fruit and vegetables in the winter. But preserving was sort of a hedge against the seasons rather than a how am I going to find food to eat? There is no food here. The military was different. And Napoleon had the largest army in the world at the time. And it was just proving a real limitation to his military success how to feed these guys. Traditionally, an army would have fed off the land.