Defense in Depth, the world's first, and maybe only World War One RTS/FPS Hybrid. Control many different armies such as those of the American Expeditionary Force, the British Expeditionary Force, and more. Order different forms of forces in the first modern war, including tanks, airplanes, and armored cars. Get up close and personal by possessing infantry and personnel to do the job right, yourself.
The Mark V Tank was used around the closing of the war, around the time the AEF got into the fighting.