One of our sons has been in a situation where he slept for some time in a tent in January, or in the open and woke with snow on his face. He swears it was not all that uncomfortable, but I can hardly believe him. These tents don't look like they would be much protection from the cold. The cabins in the background are perhaps the officers quarters? Not sure why the didn't build winter quarters for all the men. Maybe someone with more knowledge of the Nashville campaign can elaborate?