Planes were also used for the first time. At first they were used to deliver bombs and for spying work but became fighter aircraft armed with machine guns, bombs, and some times canons. Flights between two planes in the sky become know as 'dogfights'
The first machine gun needed 4-6 men to work them and had to be on a flat surface.
they used Flamethrowers in WW1. most people were scared of Flamethrower .
Trenches were in the worst there were rats everywhere. trenches help keep solider from gun fire.
Terpedoes were used by submarines. The Germans used torpedoes to blow up ship carrying supplies from a.u.s. to Britain.