How did new weapons change the nature of war during world war 1?

New weapons during World War I, such as machine guns, tanks, and poison gas, fundamentally changed the nature of warfare by increasing lethality and altering tactics. The introduction of machine guns led to trench warfare, resulting in prolonged stalemates and high casualty rates. Artillery became more advanced, allowing for long-range bombardments that could devastate enemy positions before infantry assaults. Additionally, the use of tanks provided mobility on the battlefield, challenging the static nature of trench warfare and paving the way for modern mechanized warfare.