It's amongst these massive armies that a few good men and true rise up to take the lead. When the line is breached, when the ship is sinking, when the bombers are dropping their loads, is when heroes come to the fore. A man stands up and cheers his fellows on while leading the charge, such a man will be your character in this role playing game.
Trench Full of Heroes is a micro RPG that prints on a single sheet of paper and folds into a little booklet using the "PocketMod" system.
Available from RPGNow and DriveThruRPG for only 99c (about £0.60)
Free scenario posted at RPG-Geek (you may need to join to see the file, joining is free)