Trench warfare is a type of combat in which opposing troops fight from trenches, especially those dug into the ground. It was used extensively in World War I, and to a lesser extent in World War II.
The introduction of tanks and airplanes as weapons in World War I led to the development of trench warfare. Tanks were used to break through enemy lines, while airplanes were used to attack enemy positions from the air. In response, armies dug trenches to protect their troops from these new weapons.
Trench warfare was a very costly form of combat. Millions of soldiers were killed or injured in the trenches. The conditions in the trenches were also very difficult. Soldiers had to live in close quarters, with little food or water. They were often exposed to enemy fire, and they were also at risk of disease.
Trench warfare ended with the armistice that ended World War I in 1918. However, the legacy of trench warfare continued to shape military thinking for many years to come.
