Trench Warfare - Trench Warfare was a form of field fortification, consisting of parallel rows of trenches. During World War 1 trenches had begun to appear by late 1914. On the western front, trenches ran from the Belgium border to the Swiss Border, and they soon became home to millions of soldiers. Trenches were formed in zigzags, as opposed to straight lines. This was to prevent attackers from shooting straight down the trench, and it helped to reduce the effects of blasts from shells.