Trench Warfare in World War I During World War I, many new tactics and weapons came about. One of the new tactics was trench warfare. It was used the most from 1914-1918. It changed not only the way the war was fought, but the way the soldiers viewed their enemies. There are positives and negatives to every tactic, especially trench warfare. Trench warfare’s effectiveness directly impacted the war. Because it was not extremely effective, it often tired out the soldiers and prolonged the war. Trench warfare introduced new infections and diseases, like trench foot and trench fever. It also contributed to many more soldiers falling ill due to influenza, malaria, cholera, typhoid, and diabetes. There were many fallen soldiers due to this. The