This lecture introduce on Trenches in World War. Trenches dug from English Channel to Switzerland over 6,250 miles and 6 to 8 feet deep. The trench experience on the Western Front was one of the most sustained onslaughts on the human sensorium. Immobilized both sides for 4 years. Death was a constant companion to those serving in the line, even when no raid or attack was launched or defended against.