WW2 flamethrower

Using fire, more specifically using flamethrowers became standardized in the 20th century, but it has his origins in ancient Greece (the so called Greek fire) and in China. Modern flamethrowers were introduced during WW1 in it's infamous trench warfare. They were also used in WW2 and later on.

It werfs flammen.

Using a flamethrower was a great way to clear out trenches in WW1. In WW2, as we can see on the picture, a group of American soldiers is using it on what seems to be a bunker. The usage of flamethrowers was very important to clear out caves and underground networks / fortifications.