I think coffee was a necessary drink to keep the soldiers aware and heated also a big psychological boost for them. I think it was a great way to motivate the soldiers, I believe coffee was the only thing that reminds the home town to the soldiers and coffee was the best thing on the menu. It is very expensive and very hard to feed an army. They have to use very simple food and must be easy to cook and carry it one place to another. Also food has to stay good for a long time. You do not want to poison your soldiers by mistake during the war. The most fascinating thing about the Civil War is that they learnt very quickly how to manage their food and how to cook it.