Many, many moons ago an elderly friend of my parents passed away and we got a box of Christmas decorations. In there were decorations from around the mid to late 19th century - we have them carefully put away! There was a long string of small tin plates, like cupcake holders. You put candles in there and then everybody got around the tree and sang carols while lighting the candles. Robert E Lee talked about a houseful of family members - good thing he had a BIG house! - and having dinner then a special punch his daughter made up. I can't recall much in the way of gift giving at that time.
The war didn't take much of a Christmas break. Forrest set off on his West Tennessee raid in 1862 on Dec 11 and spent Christmas week ripping up the railroads around Jackson. That was one of his masterpieces and he did have some good Union loot that, rumor has it, was distributed to distressed residents of the area around abouts.