The always amazing Perfect Captain has released A Coat of Steel, a set of free wargames rules for the Wars of the Roses. There’s also a campaign game called “A Crown of Paper.”
Christmas At War

Painting by Robert Blair from the US Army Military History Site
Here’s a nice Christmas story from WWII. This site has some WWII Christmas pictures.
Christmas War Paper Models
One Monk offers a selection of Christmas Wars paper figures. There are polar bears, Krampus and Velociraptors in Santa Hats in Scarves.
I have no idea what you would use these for. But they’re cool.
Civil War Christmas

More at Son of the South.
Making Wargames Terrain From Christmas Villages
I have often looked at those cheap Christmas village buildings and thought that they would be great for tabletop wargaming — if only they didn’t have those piles of molded snow and Christmas decorations. Here’s an article about converting one of those pieces.
The solution to the snow piles is a head slapper: convert them to patches of moss with foam turf.