Here’s a neat photo album – history of the US Philippine War 1899 – 1902.
20th Century
The Nagziger Collection Online
For many years, George’s Nafziger’s collection of orders of battle for conflicts dating from the 1600s to the 1900s have been a mainstay of the historical wargaming community.
Once available only commercially, Nafziger recently donated his collection to the Army’s Combined Arms Research Library.
The actual files are available as pdfs here. But as they’re numbered and not named, you’ll also want to consult the finding aid here. And a search function.
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.
Russian Civil War Flags
Here’s a selection of downloadable flags for the Russian Civil War. That’s a period I’ve always wanted to paint and game. I can’t imagine a more colorful selection of armies and characters.
Uniforms of Norway and Sweden 1500 – 1909
Here’s a large selection of color plates of the uniforms of Norway and Sweden from 1500 – 1909.