The technological advancement that changed warfare during World War I was the introduction of tanks. First used in battle by British forces in 1916, tanks provided unprecedented battlefield mobility and firepower, overcoming the challenges of trench warfare. Their armored design allowed them to traverse difficult terrain and breach enemy defenses, changing the dynamics of land combat. The effectiveness of tanks paved the way for new military tactics and the mechanization of armies. Their emergence in World War I signaled the beginning of a new era in warfare, leading to further advancements in armored vehicles and changing military strategy in the decades that followed.