A stalemate emerged as trenches were dug by the French in order to stop the German advance. It was very difficult to advanced beyond the trench system.
How did the creation of trenches lead to the creation of new types of weapons and warfare?
Gas emerged because it was difficult to advance so attackers fired gas into the trenches before crossing no mans land. Artillery was used to bombard the trenches. Tunellers tried to dig into enemy trenches and blow them up.