Khan Academy
Khan Academy: Us History: 1890 1945: World War I: Military & Diplomacy
A quick comprehension check over military and diplomacy
Have Fun With History
Have Fun With History: World War 1
Learning module on World War One with links to resources such as museums and videos on WWI soldiers, songs and general historical information.
First World War
First World War: Weapons of War
Part of a larger site on WWI, Weapons of War gives a detailed review of weapon technology. Thorough information is provided on bayonets, flamethrowers, grenades, machine guns, pistols, poison gas, rifles, tanks, and trench mortars.
BBC
Bbc History: World Wars: World War One: The First Battle of the Atlantic
Historian Gary Sheffield recounts the events, strategies, and outcomes of the Battle for the Atlantic, in a six-part illustrated article.