Early in World War I, many inventions and innovations were attempted. Many failed. Some should have worked. The Volley Shield was a protective wall invented for use by The British Army, for use in the trenches. Made of 1.5 inches of iron plate, it featured 3 levels of firing holes (or slots). Large enough to accommodate 3 lines of infantrymen (30 total), one line would lay in the Prone Firing position, the second Line (kneeling over them) – followed by the third Line, standing. The Volley Shield could be deployed in sections on top of the trenches. It's obvious drawback – artillery.