What is a front line dugout from World War 1?

Dugouts were protective holes dug out of the sides of trenches. The size of dugouts varied a great deal and sometimes could house over ten men. A manual published by the British Army recommended dugouts that were between 2 ft. and 4 ft. 6 in. wide, roofed with corrugated iron or brushwood and then covered with a minimum of 9 inches of earth.