Technological advancements that were developed pre-ww1 and perfected after the war highly influenced the modern combat of the 20th century. The use of artillery had been massively used from far distances to bombarded enemy lines. New times of guns were used such as the "Maxim Gun" which was one of the first machine guns that allowed the shooter to mow down lines of enemies. Chemical warfare had been used as well being fired from artillery and burning the lungs of enemy troops using gases such as, "Mustard Gas." What was also used were armored trains with canons and machine guns. Tanks were developed during the war by the British such as the "Mark I." Planes were also being weaponized by dropping bombs on battlefields and cities. "Zeppelins" were these massive blimps that also dropped loads of bombs on enemy territory.
After the war these technologies would slowly be developed and improved, some would be trashed away or converted for public use. Examples, the tank was developed to be more light and agile by the Germans and Russian pre-ww2. Zeppelins on the other had were converted as people movers or "airships" that would transfer people across oceans instead of being used for war.